/* ============================================================
   mateksvalmis — design system
   ============================================================ */

/* ── Tokens ─────────────────────────────────────────────── */
:root {
  /* Content */
  --bg:           #f6f5f1;
  --surface:      #eeece7;
  --surface2:     #e5e3dd;
  --card:         #ffffff;
  --border:       #e2e0db;
  --border2:      #d1cfc9;

  /* Text */
  --text:         #1a1a2e;
  --text2:        #5a5870;
  --text3:        #8a8698;

  /* Aliases (new names used in prototype / future code) */
  --text-primary:   var(--text);
  --text-secondary: var(--text2);
  --text-tertiary:  var(--text3);
  --text-inverse:   #ffffff;
  --divider:        var(--border);
  --surface-hover:  var(--surface2);

  /* Accent — blue */
  --accent:       #2563eb;
  --accent-hover: #1d4ed8;
  --accent-light: #dbeafe;
  --accent-subtle:#eff6ff;
  --accent-border: rgba(37,99,235,0.25);

  /* Sidebar */
  --sb-bg:        #edeae4;
  --sb-text:      #6b6880;
  --sb-text-dim:  rgba(90,88,112,0.4);
  --sb-border:    rgba(0,0,0,0.07);
  --sb-hover:     rgba(0,0,0,0.04);
  --sb-active-bg: #dbeafe;
  --sb-active:    #2563eb;
  --sb-text-hover:#1a1a2e;

  /* Status */
  --green:        #22c55e;
  --green-light:  #f0fdf4;
  --red:          #ef4444;
  --red-light:    #fef2f2;
  --gold:         #f59e0b;
  --gold-light:   #fffbeb;

  /* Status aliases */
  --success:       var(--green);
  --success-light: var(--green-light);
  --error:         var(--red);
  --error-light:   var(--red-light);
  --warning:       var(--gold);
  --warning-light: var(--gold-light);

  --sans: 'Inter', system-ui, sans-serif;
  --mono: 'JetBrains Mono', ui-monospace, monospace;

  --sidebar-w: 232px;
  --radius: 8px;
  --radius-lg: 10px;

  --shadow-xs: 0 1px 2px rgba(0,0,0,0.04);
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
  --shadow:    0 2px 8px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 2px 8px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-lg: 0 8px 24px rgba(0,0,0,0.08), 0 2px 4px rgba(0,0,0,0.04);

  --mobile-topbar-safe: max(12px, env(safe-area-inset-top, 0px));
  --mobile-topbar-height: calc(60px + var(--mobile-topbar-safe));
}

/* ── Reset ──────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

/* ── Global custom scrollbar ────────────────────────────── */
* {
  scrollbar-width: thin;
  scrollbar-color: var(--border2) transparent;
}
*::-webkit-scrollbar { width: 6px; height: 6px; }
*::-webkit-scrollbar-track { background: transparent; }
*::-webkit-scrollbar-thumb {
  background: var(--border2);
  border-radius: 99px;
}
*::-webkit-scrollbar-thumb:hover { background: var(--text3); }

html { height: 100%; }
body {
  font-family: var(--sans);
  font-size: 14px;
  font-weight: 400;
  color: var(--text);
  background: var(--bg);
  height: 100%;
  display: flex;
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ── Layout ─────────────────────────────────────────────── */
#sidebar {
  width: var(--sidebar-w);
  flex-shrink: 0;
  height: 100%;
  background: var(--sb-bg);
  color: var(--sb-text);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* Ensure sidebar panels can shrink so the topic list scrolls properly */
#topic-panel,
#exam-panel {
  min-height: 0;
}

#main {
  flex: 1;
  min-width: 0;
  height: 100%;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background: var(--bg);
}

#mobile-topbar,
#mobile-sidebar-backdrop {
  display: none;
}

#mobile-bottom-nav,
#mobile-more-backdrop,
#mobile-more-sheet {
  display: none;
}

#mobile-topbar {
  align-items: center;
  gap: 12px;
  padding: var(--mobile-topbar-safe) 14px 10px;
  border-bottom: 1px solid var(--border);
  background: color-mix(in srgb, var(--card) 92%, transparent);
  backdrop-filter: blur(14px);
  flex-shrink: 0;
}

.mobile-topbar-btn {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--text);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-xs);
}

.mobile-topbar-btn svg {
  width: 18px;
  height: 18px;
}

.mobile-topbar-btn--ghost {
  margin-left: auto;
}

.mobile-topbar-copy {
  min-width: 0;
}

.mobile-topbar-title {
  font-size: 14px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text);
}

.mobile-topbar-sub {
  font-size: 11px;
  color: var(--text3);
  margin-top: 2px;
}

#mobile-sidebar-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(14, 18, 31, 0.38);
  backdrop-filter: blur(2px);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.22s ease;
  z-index: 40;
}

/* ── Sidebar ─────────────────────────────────────────────── */
.sb-logo {
  padding: 20px 16px 16px;
  border-bottom: 1px solid var(--sb-border);
  cursor: pointer;
  transition: opacity 0.15s ease;
}
.sb-logo:hover { opacity: 0.85; }
.sb-logo-name {
  font-family: var(--sans);
  font-style: normal;
  font-size: 15px;
  font-weight: 700;
  color: #e8e5f5;
  letter-spacing: -0.02em;
  line-height: 1.2;
}
.sb-logo-sub {
  font-size: 10px;
  color: var(--sb-text-dim);
  margin-top: 2px;
  font-family: var(--mono);
  letter-spacing: 0.04em;
}

.sb-nav { padding: 8px 8px 0; }
.sb-nav-item {
  display: flex;
  align-items: center;
  gap: 9px;
  width: 100%;
  padding: 8px 10px;
  font-size: 13px;
  font-weight: 400;
  color: var(--sb-text);
  background: none;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  text-align: left;
  transition: background 0.15s ease, color 0.15s ease;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-bottom: 1px;
  letter-spacing: 0;
  font-family: var(--sans);
  line-height: 1;
}
.sb-nav-item svg {
  width: 15px;
  height: 15px;
  stroke-width: 1.75;
  flex-shrink: 0;
  opacity: 0.7;
  transition: opacity 0.15s ease;
}
.sb-nav-item:hover { background: var(--sb-hover); color: var(--sb-text-hover); }
.sb-nav-item:hover svg { opacity: 1; }
.sb-nav-item.active {
  background: var(--sb-active-bg);
  color: var(--sb-active);
  font-weight: 500;
}
.sb-nav-item.active svg { opacity: 1; }

.sb-divider { height: 1px; background: var(--sb-border); margin: 6px 8px; }

.sb-panel-label {
  padding: 10px 16px 4px;
  font-size: 9px;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--sb-text-dim);
  font-family: var(--mono);
}
#sb-topic-list {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  padding: 2px 8px 8px;
  scrollbar-width: thin;
  scrollbar-color: #1a2845 transparent;
}
.sb-exams {
  padding: 2px 8px 8px;
  overflow-y: auto;
  flex: 1;
  min-height: 0;
  scrollbar-width: thin;
  scrollbar-color: #1a2845 transparent;
}

/* Sidebar topic rows (JS-generated) */
.tp-topic-row {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 5px 8px;
  border-radius: 6px;
  cursor: pointer;
  transition: background 0.15s ease;
  margin-bottom: 1px;
}
.tp-topic-row:hover { background: var(--sb-hover); }
.tp-topic-row.active { background: var(--sb-active-bg); }
.tp-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  flex-shrink: 0;
  transition: background 0.2s;
}
.tp-name {
  font-size: 12px;
  color: var(--sb-text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  flex: 1;
  line-height: 1.3;
}
.tp-topic-row.active .tp-name { color: var(--sb-active); font-weight: 500; }

/* Topic list items in sidebar */
.tp-row {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 5px 8px;
  border-radius: 5px;
  cursor: pointer;
  transition: background 0.1s;
}
.tp-row:hover { background: var(--sb-hover); }
.tp-row.active { background: var(--sb-active-bg); }
.tp-row-name {
  flex: 1;
  font-size: 11.5px;
  color: var(--sb-text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.tp-row.active .tp-row-name { color: var(--sb-active); font-weight: 500; }
.tp-row-pct { font-family: var(--mono); font-size: 10px; color: var(--sb-text-dim); }
.tp-row-bar { height: 2px; background: var(--sb-border); border-radius: 99px; margin-top: 2px; }
.tp-row-fill { height: 2px; border-radius: 99px; }
.tp-row-meta { display: none; }

/* Exam list items in sidebar */
.sb-exam-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 5px 8px;
  border-radius: 5px;
  cursor: pointer;
  font-size: 11.5px;
  color: var(--sb-text);
  transition: background 0.1s;
}
.sb-exam-item:hover { background: var(--sb-hover); }
.sb-exam-item.done { color: #5ec48a; }
.sb-exam-pct { font-family: var(--mono); font-size: 10px; color: var(--sb-text-dim); }

/* Sidebar footer */
.sb-footer {
  border-top: 1px solid var(--sb-border);
  padding: 10px 8px;
  display: flex;
  gap: 4px;
}
.sb-footer-btn {
  flex: 1;
  padding: 10px 8px;
  font-size: 13px;
  font-weight: 500;
  font-family: var(--sans);
  color: var(--sb-text);
  background: var(--sb-hover);
  border: 1px solid var(--sb-border);
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.15s ease;
  text-align: center;
}
.sb-footer-btn:hover { background: var(--sb-active); }
.sb-footer-btn.danger { color: #f87171; }
.sb-footer-btn.danger:hover { background: rgba(248,113,113,0.12); }

#sb-tabs { display: none; }
.sb-tab  { display: none; }

/* ── Buttons ─────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 5px;
  padding: 6px 14px;
  font-size: 12.5px;
  font-weight: 500;
  font-family: var(--sans);
  border-radius: var(--radius);
  border: 1px solid transparent;
  cursor: pointer;
  transition: background 0.12s, border-color 0.12s, color 0.12s, box-shadow 0.12s, transform 0.1s;
  white-space: nowrap;
  line-height: 1.5;
  letter-spacing: 0.01em;
}
.btn-primary {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
  box-shadow: 0 1px 4px rgba(37,99,235,0.25);
}
.btn-primary:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
  box-shadow: 0 2px 8px rgba(37,99,235,0.32);
  transform: translateY(-1px);
}
.btn-outline {
  background: var(--card);
  color: var(--text2);
  border-color: var(--border);
  box-shadow: var(--shadow-xs);
}
.btn-outline:hover {
  background: var(--card);
  color: var(--text);
  border-color: var(--border2);
  box-shadow: var(--shadow-sm);
  transform: translateY(-1px);
}
.btn:disabled { opacity: 0.38; cursor: not-allowed; transform: none !important; box-shadow: none !important; }

#exam-view { display: none; flex-direction: column; flex: 1; overflow: hidden; position: relative; }

/* ── Exam header ─────────────────────────────────────────── */
.exam-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 20px;
  border-bottom: 1px solid var(--border);
  background: var(--card);
  gap: 16px;
  flex-shrink: 0;
  box-shadow: 0 1px 0 var(--border);
  position: relative;
  z-index: 70;
}
.eh-left { display: flex; flex-direction: column; gap: 1px; min-width: 0; }
.eh-eyebrow {
  font-family: var(--mono);
  font-size: 9.5px;
  color: var(--text3);
  letter-spacing: 0.07em;
  text-transform: uppercase;
}
.eh-title { font-size: 14px; font-weight: 500; color: var(--text); }
.eh-right {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-shrink: 0;
  flex-wrap: wrap;
  justify-content: flex-end;
}
#sim-attribution {
  font-family: var(--mono);
  font-size: 9px;
  color: var(--text3);
  letter-spacing: 0.05em;
  margin-top: 1px;
}

/* ── Part tabs ───────────────────────────────────────────── */
.part-tabs {
  display: flex;
  gap: 0;
  padding: 0 20px;
  border-bottom: 1px solid var(--border);
  background: var(--card);
  flex-shrink: 0;
  position: relative;
  z-index: 45;
}
.part-tab {
  padding: 9px 16px;
  font-size: 12px;
  font-weight: 400;
  color: var(--text3);
  border: none;
  background: none;
  border-bottom: 2px solid transparent;
  cursor: pointer;
  transition: color 0.1s, border-color 0.1s;
  margin-bottom: -1px;
  letter-spacing: 0.01em;
}
.part-tab.active { color: var(--accent); border-bottom-color: var(--accent); font-weight: 500; }
.part-tab:hover:not(.active) { color: var(--text2); }

/* ── Question nav ────────────────────────────────────────── */
.q-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
  padding: 10px 20px;
  border-bottom: 1px solid var(--border);
  background: var(--card);
  flex-shrink: 0;
  position: relative;
  z-index: 40;
}
.q-dot {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  border: 1.5px solid var(--border);
  background: var(--surface);
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 600;
  color: var(--text3);
  cursor: pointer;
  transition: all 0.13s;
  display: flex;
  align-items: center;
  justify-content: center;
  user-select: none;
  box-shadow: var(--shadow-xs);
}
.q-dot:hover { border-color: var(--accent-border); color: var(--accent); background: var(--accent-subtle); }
.q-dot.active {
  border-color: var(--accent);
  color: #fff;
  background: var(--accent);
  box-shadow: 0 2px 8px rgba(37,99,235,0.28);
}
.q-dot.correct {
  background: var(--green);
  border-color: var(--green);
  color: #fff;
  box-shadow: 0 1px 4px rgba(34,197,94,0.25);
}
.q-dot.wrong {
  background: var(--red);
  border-color: var(--red);
  color: #fff;
  box-shadow: 0 1px 4px rgba(239,68,68,0.25);
}
.q-dot.partial {
  border-color: var(--gold);
  color: var(--gold);
  background: var(--gold-light);
}
.q-dot--locked {
  opacity: 0.45;
  cursor: default;
  font-size: 11px;
}
.q-dot--locked:hover { border-color: var(--border); color: var(--text3); background: transparent; }

/* ── Question area ───────────────────────────────────────── */
.q-area {
  flex: 1;
  overflow-y: auto;
  padding: 28px 24px;
  background: var(--bg);
}
.q-area-inner {
  max-width: 720px;
  margin: 0 auto;
}

/* Tahvel */
.exam-workspace {
  --tahvel-w: min(48vw, 760px);
  display: flex;
  flex: 1;
  min-height: 0;
  overflow: hidden;
  background: var(--bg);
}

.tahvel-toggle-btn.active {
  color: #fff;
  background: var(--accent);
  border-color: var(--accent);
  box-shadow: 0 2px 10px rgba(37,99,235,0.22);
}

.tahvel-resizer {
  display: none;
  width: 7px;
  flex: 0 0 7px;
  cursor: col-resize;
  background: transparent;
  border-left: 1px solid var(--border);
  border-right: 1px solid var(--border);
  position: relative;
  z-index: 6;
}

.tahvel-resizer::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 3px;
  height: 48px;
  border-radius: 999px;
  background: var(--border2);
  transform: translate(-50%, -50%);
}

#exam-view.tahvel-open .tahvel-resizer {
  display: block;
}

#exam-view.tahvel-resizing,
#exam-view.tahvel-resizing * {
  cursor: col-resize !important;
  user-select: none !important;
}

.tahvel-panel {
  display: none;
  width: var(--tahvel-w);
  min-width: 360px;
  max-width: 78vw;
  flex: 0 0 var(--tahvel-w);
  flex-direction: column;
  min-height: 0;
  overflow: hidden;
  background: #fff;
  color: #111827;
  border-left: 1px solid #e5e7eb;
}

.tahvel-panel.open {
  display: flex;
}

.tahvel-topbar {
  min-height: 82px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 14px 10px;
  background: rgba(255,255,255,0.96);
  border-bottom: 1px solid #e5e7eb;
  box-shadow: 0 1px 8px rgba(15,23,42,0.06);
  flex-shrink: 0;
  z-index: 5;
}

.tahvel-board-name {
  min-width: 0;
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding-top: 2px;
}

.tahvel-home-dot {
  width: 30px;
  height: 30px;
  border-radius: 8px;
  background: #f3f4f6;
  border: 1px solid #e5e7eb;
  position: relative;
  flex-shrink: 0;
}

.tahvel-home-dot::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 9px;
  width: 12px;
  height: 10px;
  border: 2px solid #111827;
  border-top: 0;
}

.tahvel-home-dot::after {
  content: "";
  position: absolute;
  left: 8px;
  top: 6px;
  width: 12px;
  height: 12px;
  border-left: 2px solid #111827;
  border-top: 2px solid #111827;
  transform: rotate(45deg);
}

.tahvel-board-title {
  color: #111827;
  font-size: 14px;
  font-weight: 800;
  line-height: 1.1;
}

.tahvel-board-status {
  margin-top: 3px;
  color: #6b7280;
  font-size: 11px;
  line-height: 1;
}

.tahvel-top-actions {
  display: flex;
  align-items: flex-start;
  gap: 7px;
  flex-shrink: 0;
}

.tahvel-fn-top {
  display: grid;
  grid-template-columns: minmax(150px, 230px) auto;
  gap: 6px;
  align-items: center;
  margin-right: 6px;
}

.tahvel-fn-chips {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  gap: 4px;
  overflow-x: auto;
  scrollbar-width: none;
}

.tahvel-fn-chips::-webkit-scrollbar {
  display: none;
}

.tahvel-fn-chips button {
  min-width: 28px;
  height: 24px;
  border: 1px solid #e5e7eb;
  border-radius: 7px;
  background: #f9fafb;
  color: #111827;
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 800;
  cursor: pointer;
}

.tahvel-fn-chips button:hover {
  background: #eff6ff;
  border-color: #bfdbfe;
}

.tahvel-glass-btn,
.tahvel-tool-btn,
.tahvel-fn-btn {
  border: 1px solid transparent;
  background: transparent;
  color: #111827;
  font-family: var(--sans);
  cursor: pointer;
  transition: background 0.12s, border-color 0.12s, box-shadow 0.12s, transform 0.12s;
}

.tahvel-glass-btn {
  height: 34px;
  min-width: 34px;
  border-radius: 8px;
  padding: 0 10px;
  font-size: 14px;
  font-weight: 700;
}

.tahvel-glass-btn:hover,
.tahvel-tool-btn:hover,
.tahvel-fn-btn:hover {
  background: #f3f4f6;
  border-color: #e5e7eb;
}

.tahvel-glass-btn.danger {
  color: #dc2626;
}

.tahvel-canvas-wrap {
  position: relative;
  flex: 1;
  min-height: 0;
  overflow: hidden;
  background-color: #fff;
}

#tahvel-canvas {
  display: block;
  width: 100%;
  height: 100%;
  touch-action: none;
  cursor: crosshair;
}

.tahvel-inline-editor {
  position: absolute;
  z-index: 8;
  width: 260px;
  padding: 10px;
  border: 1px solid rgba(148,163,184,0.35);
  border-radius: 12px;
  background: rgba(255,255,255,0.96);
  box-shadow: 0 18px 44px rgba(15,23,42,0.18);
  backdrop-filter: blur(16px);
}

.tahvel-inline-label {
  margin-bottom: 6px;
  color: #6b7280;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.tahvel-inline-input {
  width: 100%;
  height: 36px;
  border: 1px solid #d1d5db;
  border-radius: 8px;
  background: #fff;
  color: #111827;
  padding: 0 10px;
  font-family: var(--sans);
  font-size: 13px;
  outline: none;
}

.tahvel-inline-input:focus {
  border-color: #2563eb;
  box-shadow: 0 0 0 3px rgba(37,99,235,0.12);
}

.tahvel-inline-actions {
  display: flex;
  justify-content: flex-end;
  gap: 6px;
  margin-top: 8px;
}

.tahvel-inline-actions button {
  height: 30px;
  border: 1px solid #e5e7eb;
  border-radius: 8px;
  background: #fff;
  color: #374151;
  padding: 0 10px;
  font-size: 12px;
  font-weight: 800;
  cursor: pointer;
}

.tahvel-inline-actions button.primary {
  background: #111827;
  border-color: #111827;
  color: #fff;
}

.tahvel-fn-input {
  min-width: 0;
  height: 32px;
  border: 1px solid #d1d5db;
  border-radius: 8px;
  background: #fff;
  color: #111827;
  padding: 0 10px;
  font-family: var(--mono);
  font-size: 12px;
  outline: none;
}

.tahvel-fn-input:focus {
  border-color: #2563eb;
  box-shadow: 0 0 0 3px rgba(37,99,235,0.12);
}

.tahvel-fn-btn {
  min-height: 32px;
  border-radius: 8px;
  padding: 0 12px;
  background: #111827;
  color: #fff;
  font-size: 12px;
  font-weight: 800;
}

.tahvel-fn-btn:hover {
  background: #1f2937;
  border-color: #1f2937;
}

.tahvel-toolbar {
  position: absolute;
  left: 50%;
  bottom: 20px;
  z-index: 4;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 4px;
  width: min(620px, calc(100% - 32px));
  padding: 6px;
  border: 1px solid rgba(148,163,184,0.32);
  border-radius: 14px;
  background: rgba(255,255,255,0.92);
  box-shadow: 0 18px 48px rgba(15,23,42,0.18);
  transform: translateX(-50%);
  backdrop-filter: blur(18px);
  overflow: visible;
}

.tahvel-tool-btn {
  width: 34px;
  height: 34px;
  border-radius: 10px;
  padding: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 auto;
  font-size: 13px;
  font-weight: 800;
}

.tahvel-tool-btn.active {
  background: #eff6ff;
  border-color: #93c5fd;
  box-shadow: inset 0 0 0 1px #bfdbfe;
}

.tahvel-tool-btn.color {
  width: 28px;
  height: 28px;
  border-radius: 999px;
}

.tahvel-swatch {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  border: 2px solid rgba(255,255,255,0.9);
  box-shadow: 0 0 0 1px rgba(15,23,42,0.22);
}

.tahvel-tool-sep {
  width: 1px;
  height: 22px;
  margin: 0 1px;
  background: #e5e7eb;
  flex: 0 0 1px;
}

/* Question meta / header */
.q-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}
.q-report-btn {
  margin-left: auto;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 3px 10px;
  border-radius: 99px;
  border: 1.5px solid var(--border);
  background: transparent;
  color: var(--text3);
  font-size: 10px;
  font-weight: 600;
  font-family: var(--mono);
  letter-spacing: 0.05em;
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s, background 0.15s;
}
.q-report-btn:hover {
  color: var(--red);
  border-color: rgba(239,68,68,0.4);
  background: rgba(239,68,68,0.07);
}
/* Report modal */
.report-overlay {
  position: fixed; inset: 0; z-index: 9999;
  background: rgba(0,0,0,0.55);
  display: flex; align-items: center; justify-content: center;
  padding: 20px;
}
.report-modal {
  background: var(--card);
  border: 1px solid var(--border-strong);
  border-radius: 16px;
  padding: 28px 24px 20px;
  width: 100%; max-width: 420px;
  box-shadow: 0 24px 64px rgba(0,0,0,0.5);
}
.report-modal-title {
  font-size: 15px; font-weight: 700; margin-bottom: 6px;
}
.report-modal-sub {
  font-size: 12px; color: var(--text2); margin-bottom: 16px; line-height: 1.5;
}
.report-modal-qid {
  font-family: var(--mono); font-size: 10px; color: var(--text3);
  background: var(--surface); border-radius: 6px; padding: 4px 8px;
  margin-bottom: 14px; display: inline-block;
}
.report-textarea {
  width: 100%; padding: 12px 14px;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: 10px; color: var(--text); font-size: 13px;
  font-family: Inter, sans-serif; resize: vertical; min-height: 90px;
  outline: none; transition: border-color 0.15s; line-height: 1.5;
}
.report-textarea:focus { border-color: var(--accent-border); }
.report-modal-actions {
  display: flex; gap: 8px; margin-top: 14px; justify-content: flex-end;
}
.report-cancel-btn {
  padding: 9px 16px; border-radius: 8px; border: 1px solid var(--border);
  background: transparent; color: var(--text2); font-size: 13px;
  font-weight: 600; cursor: pointer; transition: background 0.15s;
}
.report-cancel-btn:hover { background: var(--surface); }
.report-submit-btn {
  padding: 9px 18px; border-radius: 8px; border: none;
  background: var(--red); color: #fff; font-size: 13px;
  font-weight: 700; cursor: pointer; transition: opacity 0.15s;
}
.report-submit-btn:hover { opacity: 0.85; }
.report-submit-btn:disabled { opacity: 0.5; cursor: default; }
.report-success-msg {
  font-size: 13px; color: var(--green); font-weight: 600; margin-top: 10px;
  display: none;
}
.q-badge {
  display: inline-flex;
  align-items: center;
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.05em;
  padding: 3px 10px;
  border-radius: 99px;
  border: 1.5px solid;
}
.q-badge-num {
  color: var(--accent);
  border-color: var(--accent-border);
  background: var(--accent-subtle);
}
.q-badge-part {
  font-family: var(--mono);
  font-size: 10px;
  color: var(--text3);
  letter-spacing: 0.03em;
}

.q-num {
  font-family: var(--mono);
  font-size: 9.5px;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text3);
  margin-bottom: 10px;
}
.q-text {
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--text);
  margin-bottom: 24px;
  font-weight: 400;
}
.q-pts {
  font-family: var(--mono);
  font-size: 9.5px;
  color: var(--text3);
  margin-bottom: 12px;
}

/* Subpart cards */
.subparts { display: flex; flex-direction: column; gap: 16px; margin-top: 20px; }
.subpart {
  background: var(--card);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: border-color 0.15s;
}
.subpart.checked-correct { border-color: #86d4a8; }
.subpart.checked-wrong   { border-color: #f0a8a8; }
.subpart-header {
  display: flex;
  align-items: center;
  padding: 11px 16px 10px;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}
.subpart-label {
  font-size: 12.5px;
  font-weight: 600;
  color: var(--text2);
  letter-spacing: 0.01em;
}
.subpart-body { padding: 16px; }

/* Answer inputs */
.ans-label {
  font-size: 11.5px;
  font-weight: 500;
  color: var(--text2);
  margin-bottom: 5px;
  display: block;
}
.ans-row { margin-bottom: 14px; }
.ans-input-wrap { display: flex; align-items: center; gap: 10px; margin-bottom: 12px; }
.ans-num {
  font-family: var(--mono);
  font-size: 15px;
  font-weight: 500;
  color: var(--text);
  background: var(--bg);
  border: 2px solid var(--border);
  border-radius: var(--radius);
  padding: 9px 14px;
  outline: none;
  transition: border-color 0.14s, box-shadow 0.14s;
  width: 200px;
  box-shadow: var(--shadow-xs);
}
.ans-text {
  font-family: var(--mono);
  font-size: 13.5px;
  color: var(--text);
  background: var(--bg);
  border: 2px solid var(--border);
  border-radius: var(--radius);
  padding: 9px 14px;
  outline: none;
  transition: border-color 0.14s, box-shadow 0.14s;
  width: 100%;
  box-shadow: var(--shadow-xs);
  resize: vertical;
  min-height: 72px;
}
.ans-num:focus, .ans-text:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(37,99,235,0.12);
  background: var(--card);
}
.ans-num.correct  { border-color: var(--green); background: var(--green-light); }
.ans-num.wrong    { border-color: var(--red);   background: var(--red-light); }
.ans-text.correct { border-color: var(--green); background: var(--green-light); }
.ans-text.wrong   { border-color: var(--red);   background: var(--red-light); }
.ans-unit { font-family: var(--mono); font-size: 13px; font-weight: 500; color: var(--text3); }

/* Choice buttons */
.choices { display: flex; flex-direction: column; gap: 7px; }
.choice {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  width: 100%;
  max-width: 520px;
  padding: 11px 14px;
  font-size: 13.5px;
  font-weight: 400;
  color: var(--text);
  background: var(--bg);
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  cursor: pointer;
  text-align: left;
  transition: all 0.13s;
  box-shadow: var(--shadow-xs);
  line-height: 1.5;
}
.choice:hover:not(:disabled) {
  border-color: var(--accent-border);
  background: var(--accent-subtle);
  box-shadow: 0 2px 6px rgba(37,99,235,0.1);
}
.choice.sel {
  border-color: var(--accent);
  background: var(--accent-light);
  color: var(--accent);
  font-weight: 500;
  box-shadow: 0 2px 6px rgba(37,99,235,0.15);
}
.choice.c-ok  { border-color: var(--green); background: var(--green-light); color: #15803d; font-weight: 500; }
.choice.c-no  { border-color: var(--red);   background: var(--red-light);   color: #b91c1c; }
.choice:disabled { cursor: default; }
.choice-letter {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  border-radius: 6px;
  border: 1.5px solid currentColor;
  font-family: var(--mono);
  font-size: 10.5px;
  font-weight: 700;
  flex-shrink: 0;
  opacity: 0.7;
  margin-top: 1px;
}
.choice.sel .choice-letter,
.choice.c-ok .choice-letter { opacity: 1; }
.choice-text { flex: 1; }

/* Feedback */
.feedback-correct { font-size: 12.5px; color: var(--green); font-weight: 500; margin-top: 8px; }
.feedback-wrong   { font-size: 12.5px; color: var(--red);   font-weight: 500; margin-top: 8px; }
.feedback-manual  { font-size: 12.5px; color: var(--gold);  font-weight: 500; margin-top: 8px; }

.feedback {
  display: none;
  margin-top: 14px;
  padding: 13px 16px;
  border-radius: var(--radius);
  font-size: 13px;
  line-height: 1.7;
  border: 1.5px solid;
}
.feedback.ok {
  background: var(--green-light);
  border-color: #86d4a8;
  color: #15803d;
}
.feedback.no {
  background: var(--red-light);
  border-color: #f0a8a8;
  color: #b91c1c;
}
.feedback.unknown {
  background: var(--gold-light);
  border-color: #f0d49a;
  color: var(--text);
}
.feedback-title {
  font-weight: 700;
  font-size: 13px;
  margin-bottom: 6px;
}
.feedback-answer {
  font-family: var(--mono);
  font-size: 12.5px;
  margin-bottom: 8px;
  color: inherit;
  opacity: 0.85;
}
.feedback-text { font-size: 13px; }
.feedback-grading {
  margin-top: 10px;
  font-size: 11.5px;
  opacity: 0.7;
  border-top: 1px solid rgba(0,0,0,0.08);
  padding-top: 8px;
}
.self-assess-btns { display: flex; gap: 8px; margin-top: 10px; }
.sa-btn-ok, .sa-btn-no {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-family: var(--sans);
  font-size: 12px;
  font-weight: 600;
  padding: 6px 16px;
  border-radius: var(--radius);
  border: 1.5px solid;
  cursor: pointer;
  transition: all 0.12s;
}
.sa-btn-ok {
  color: #15803d;
  border-color: #86d4a8;
  background: var(--green-light);
}
.sa-btn-ok:hover { background: #dcfce7; border-color: var(--green); }
.sa-btn-no {
  color: #b91c1c;
  border-color: #f0a8a8;
  background: var(--red-light);
}
.sa-btn-no:hover { background: #fee2e2; border-color: var(--red); }

/* Special character buttons */
.special-chars {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
  margin-top: 10px;
  margin-bottom: 4px;
}
.sp-char-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--mono);
  font-size: 12.5px;
  font-weight: 500;
  color: var(--text2);
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: 6px;
  padding: 4px 10px;
  min-width: 36px;
  height: 30px;
  cursor: pointer;
  transition: all 0.12s;
  line-height: 1;
  box-shadow: var(--shadow-xs);
}
.sp-char-btn:hover {
  background: var(--accent-subtle);
  border-color: var(--accent-border);
  color: var(--accent);
  box-shadow: 0 1px 4px rgba(37,99,235,0.12);
}
.sp-plus-btn {
  color: var(--text3);
  font-size: 11px;
  letter-spacing: 0.04em;
}

/* Input toolbar */
.input-toolbar {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-top: 8px;
}
.frac-mode-toggle {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-family: var(--sans);
  font-size: 11px;
  font-weight: 500;
  color: var(--text3);
  background: none;
  border: 1px solid var(--border);
  border-radius: 5px;
  padding: 4px 10px;
  cursor: pointer;
  transition: all 0.12s;
  width: fit-content;
}
.frac-mode-toggle:hover { color: var(--text2); border-color: var(--border2); background: var(--surface); }
.frac-mode-toggle.active { color: var(--accent); border-color: var(--accent-border); background: var(--accent-subtle); }

/* Hint / solution */
.hint-row {
  margin-bottom: 20px;
}
.hint-btn, .show-solution-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  font-weight: 500;
  color: var(--text3);
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  padding: 6px 14px;
  cursor: pointer;
  transition: all 0.12s;
  font-family: var(--sans);
  box-shadow: var(--shadow-xs);
}
.hint-btn:hover, .show-solution-btn:hover {
  color: var(--gold);
  border-color: #f0d49a;
  background: var(--gold-light);
  box-shadow: 0 1px 4px rgba(245,158,11,0.15);
}
.hint-body {
  display: none;
  margin-top: 10px;
  padding: 13px 16px;
  background: var(--gold-light);
  border: 1px solid #f0d49a;
  border-left: 3px solid #c8820e;
  border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--text);
}
.hint-box {
  margin-top: 10px;
  padding: 11px 14px;
  background: var(--gold-light);
  border: 1px solid #f0d49a;
  border-left: 2px solid #c8820e;
  border-radius: 0 var(--radius) var(--radius) 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--text);
}
.solution-full {
  display: none;
  margin-top: 10px;
  padding: 14px 16px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 13px;
  line-height: 1.8;
  color: var(--text2);
  white-space: pre-wrap;
  box-shadow: var(--shadow-xs);
}
.solution-full.visible { display: block; }
.grading-notes {
  margin-top: 10px;
  padding: 9px 13px;
  background: var(--surface);
  border-left: 2px solid var(--border2);
  font-size: 11.5px;
  color: var(--text3);
  line-height: 1.65;
}

/* Submit row */
.submit-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 20px;
  border-top: 1px solid var(--border);
  background: var(--card);
  flex-shrink: 0;
  gap: 10px;
}
.nav-btns { display: flex; gap: 8px; }
.nav-btns .btn { padding: 8px 18px; font-size: 13px; }
.q-counter { font-family: var(--mono); font-size: 10.5px; color: var(--text3); }

/* Banners */
.topic-mode-banner {
  display: none;
  align-items: center;
  justify-content: space-between;
  padding: 7px 20px;
  background: var(--accent-light);
  border-bottom: 1px solid var(--accent-border);
  font-size: 12px;
  color: var(--accent);
  flex-shrink: 0;
}
.topic-mode-banner.visible { display: flex; }
.topic-mode-banner button {
  background: none; border: none; color: var(--accent);
  cursor: pointer; font-size: 14px; padding: 0 4px; opacity: 0.55;
}
.topic-mode-banner button:hover { opacity: 1; }

.rm-banner {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 7px 20px;
  background: var(--card);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}
.rm-banner.visible { display: flex; }
.rm-badge { font-family: var(--mono); font-size: 10.5px; font-weight: 500; color: var(--accent); white-space: nowrap; }
.rm-progress-bar { flex: 1; height: 3px; background: var(--border); border-radius: 99px; overflow: hidden; }
.rm-progress-fill { height: 100%; background: var(--accent); border-radius: 99px; transition: width 0.3s; }
.rm-counter { font-family: var(--mono); font-size: 10.5px; color: var(--text3); }
.rm-stop-btn {
  font-family: var(--mono);
  font-size: 9.5px;
  color: var(--text3);
  padding: 3px 8px;
  border: 1px solid var(--border2);
  border-radius: 4px;
  cursor: pointer;
  background: none;
  transition: all 0.1s;
  white-space: nowrap;
}
.rm-stop-btn:hover { color: var(--red); border-color: var(--red); }

#sim-timer {
  font-family: var(--mono);
  font-size: 15px;
  font-weight: 600;
  padding: 5px 11px;
  border-radius: var(--radius);
  background: var(--surface);
  border: 1px solid var(--border);
  letter-spacing: 0.04em;
}

/* ── Topics view ─────────────────────────────────────────── */
#topics-view         { display: none; flex-direction: column; flex: 1; min-height: 0; overflow: hidden; }
#topics-view.visible { display: flex; }
#re-topics-view         { display: none; flex-direction: column; flex: 1; min-height: 0; overflow: hidden; }
#re-topics-view.visible { display: flex; }

/* Inner scroll wrapper — isolates scroll from sticky header */
.tv-scroll-body {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
}

.tv-header {
  background: var(--card);
  border-bottom: 1px solid var(--border);
  padding: 20px 24px 16px;
  position: sticky;
  top: 0;
  z-index: 20;
  flex-shrink: 0;
}
.tv-eyebrow {
  font-family: var(--mono);
  font-size: 9px;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text3);
  margin-bottom: 4px;
}
.tv-title {
  font-size: 19px;
  font-weight: 500;
  color: var(--text);
  margin-bottom: 14px;
  letter-spacing: -0.02em;
}
.tv-controls { display: flex; gap: 8px; align-items: center; }
.tv-search {
  flex: 1;
  max-width: 280px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 6px 11px;
  font-family: var(--sans);
  font-size: 12.5px;
  color: var(--text);
  outline: none;
  transition: border-color 0.14s, box-shadow 0.14s;
  box-shadow: var(--shadow-xs);
}
.tv-search:focus { border-color: var(--accent); background: var(--card); box-shadow: 0 0 0 3px rgba(37,99,235,0.10); }
.tv-search::placeholder { color: var(--text3); }

.tv-body {
  padding: 20px 24px;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 10px;
  align-content: start;
}

/* Topic cards */
.tv-topic-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 15px 16px;
  cursor: pointer;
  transition: border-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
  box-shadow: var(--shadow-sm);
  position: relative;
  isolation: isolate;
}
.tv-topic-card::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  padding: 1px;
  background: conic-gradient(
    from calc(var(--glow-angle, -45) * 1deg),
    transparent 0deg,
    rgba(37, 99, 235, 0.85) 35deg,
    rgba(168, 156, 245, 1) 60deg,
    rgba(37, 99, 235, 0.85) 90deg,
    transparent 130deg
  );
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  opacity: 0;
  transition: opacity 0.3s ease;
  pointer-events: none;
}
.tv-topic-card:hover {
  border-color: transparent;
  box-shadow: var(--shadow-md), 0 0 18px rgba(37, 99, 235, 0.08);
  transform: translateY(-2px);
}
.tv-topic-card:hover::before {
  opacity: 1;
}
.tv-topic-card.tv-active {
  border-color: var(--accent);
  background: var(--accent-light);
  box-shadow: 0 0 0 3px rgba(26,107,138,0.08), var(--shadow-sm);
}

/* tv-card alaklassid eemaldatud — kasutatakse inline style'e */

/* ── Exams view ──────────────────────────────────────────── */
#exams-view { display: none; flex-direction: column; flex: 1; min-height: 0; overflow: hidden; }
#exams-view.visible { display: flex; }

.exams-scroll-body {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
}
.exams-header {
  padding: 20px 24px 16px;
  border-bottom: 1px solid var(--border);
  background: var(--card);
  flex-shrink: 0;
}
.exams-eyebrow {
  font-family: var(--mono);
  font-size: 9px;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text3);
  margin-bottom: 4px;
}
.exams-title { font-size: 19px; font-weight: 500; color: var(--text); letter-spacing: -0.02em; margin-bottom: 2px; }
.exams-meta  { font-size: 12px; color: var(--text3); }
#exams-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 10px;
  padding: 20px 24px;
}
.exam-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  cursor: pointer;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 18px 16px;
  position: relative;
  isolation: isolate;
  transition: border-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
}
.exam-card::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  padding: 1px;
  background: conic-gradient(
    from calc(var(--glow-angle, -45) * 1deg),
    transparent 0deg,
    rgba(37, 99, 235, 0.85) 35deg,
    rgba(168, 156, 245, 1) 60deg,
    rgba(37, 99, 235, 0.85) 90deg,
    transparent 130deg
  );
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  opacity: 0;
  transition: opacity 0.3s ease;
  pointer-events: none;
}
.exam-card:hover {
  border-color: transparent;
  box-shadow: var(--shadow-md), 0 0 18px rgba(37, 99, 235, 0.08);
  transform: translateY(-2px);
}
.exam-card:hover::before {
  opacity: 1;
}

/* ── Theory view ─────────────────────────────────────────── */
#theory-view         { display: none; flex-direction: column; flex: 1; min-height: 0; overflow: hidden; }
#theory-view.visible { display: flex; }

.th-scroll-body {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
}

.th-header {
  background: var(--card);
  border-bottom: 1px solid var(--border);
  padding: 13px 24px;
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}
.th-header-back {
  background: none;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 4px 11px;
  font-size: 11.5px;
  color: var(--text3);
  cursor: pointer;
  transition: all 0.1s;
  white-space: nowrap;
  font-family: var(--sans);
}
.th-header-back:hover { border-color: var(--border2); color: var(--text2); background: var(--bg); }
.th-header-text { flex: 1; min-width: 0; }
.th-eyebrow { font-family: var(--mono); font-size: 9px; font-weight: 500; letter-spacing: 0.12em; text-transform: uppercase; color: var(--text3); }
.th-title { font-size: 16px; font-weight: 500; color: var(--text); letter-spacing: -0.01em; }

.th-body { padding: 26px 24px; max-width: 720px; width: 100%; display: flex; flex-direction: column; gap: 14px; }
.th-body--overview { max-width: none; }
.th-intro {
  font-size: 13.5px;
  color: var(--text2);
  line-height: 1.8;
  padding: 14px 18px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xs);
}

.th-section {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}
.th-section-heading {
  font-size: 13.5px;
  font-weight: 500;
  color: var(--text);
  padding: 14px 18px 0;
}
.th-section-body {
  font-size: 13px;
  color: var(--text2);
  line-height: 1.85;
  padding: 8px 18px 14px;
  font-weight: 400;
}
.th-formula-box {
  margin: 0 18px 14px;
  background: var(--sb-bg);
  border: 1px solid #1c1a24;
  border-radius: var(--radius);
  padding: 13px 16px;
  font-size: 13px;
  color: #d8d4e8;
  line-height: 2;
}
.th-formula-box .katex { color: #d8d4e8; }
.th-tip-box {
  margin: 0 18px 14px;
  background: var(--gold-light);
  border-left: 2px solid #c8820e;
  padding: 9px 14px;
  font-size: 12.5px;
  color: var(--text2);
  line-height: 1.7;
}
.th-example {
  margin: 0 18px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
.th-example-problem {
  background: var(--surface);
  padding: 11px 14px;
  font-size: 13px;
  color: var(--text);
  line-height: 1.7;
  font-style: italic;
}
.th-example-solution {
  display: none;
  padding: 11px 14px;
  font-size: 13px;
  color: var(--text2);
  line-height: 1.85;
  border-top: 1px solid var(--border);
  background: var(--card);
}
.th-example-solution.visible { display: block; }
.th-example-toggle {
  width: 100%;
  padding: 7px 14px;
  background: none;
  border: none;
  border-top: 1px solid var(--border);
  font-size: 11.5px;
  color: var(--accent);
  cursor: pointer;
  text-align: left;
  transition: background 0.1s;
  font-family: var(--sans);
  font-weight: 500;
}
.th-example-toggle:hover { background: var(--accent-light); }
.th-empty { padding: 64px 24px; text-align: center; font-size: 13px; color: var(--text3); line-height: 2.2; }

/* Theory diagrams */
.th-diagram {
  margin: 2px 18px 16px;
  display: flex;
  justify-content: center;
  align-items: center;
  background: var(--surface);
  border-radius: var(--radius);
  padding: 18px 12px 14px;
  border: 1px solid var(--border);
}
.th-diagram svg { display: block; }

/* Theory overview grid */
.th-overview-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  grid-auto-rows: minmax(110px, auto);
  gap: 12px;
  padding: 0;
  width: 100%;
}
.th-topic-card {
  position: relative;
  isolation: isolate;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 22px 20px 20px;
  text-align: left;
  cursor: pointer;
  transition: border-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
  font-family: var(--sans);
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.th-topic-card::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  padding: 1px;
  background: conic-gradient(
    from calc(var(--glow-angle, -45) * 1deg),
    transparent 0deg,
    rgba(37, 99, 235, 0.85) 35deg,
    rgba(168, 156, 245, 1) 60deg,
    rgba(37, 99, 235, 0.85) 90deg,
    transparent 130deg
  );
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  opacity: 0;
  transition: opacity 0.3s ease;
  pointer-events: none;
}
.th-topic-card:hover::before {
  opacity: 1;
}
.th-topic-card:hover {
  border-color: transparent;
  box-shadow: var(--shadow-md), 0 0 18px rgba(37, 99, 235, 0.08);
  transform: translateY(-2px);
}
.th-topic-card--empty {
  opacity: 0.45;
  cursor: default;
}
.th-topic-card--empty:hover {
  border-color: var(--border);
  box-shadow: none;
  background: var(--card);
  transform: none;
}
.th-topic-card--empty:hover::before {
  opacity: 0;
}
.th-topic-card-name {
  font-size: 15px;
  font-weight: 500;
  color: var(--text);
  line-height: 1.4;
}
.th-topic-card-meta {
  font-size: 12px;
  color: var(--text3);
}
.th-topic-card-badge {
  margin-top: 8px;
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent);
  font-family: var(--mono);
}
.th-topic-card-badge--soon {
  color: var(--text3);
}
.th-footer { padding: 0 24px 40px; max-width: 720px; width: 100%; display: flex; gap: 8px; flex-wrap: wrap; }

/* ── Results view ────────────────────────────────────────── */
#results-view {
  display: none;
  flex-direction: column;
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  padding: 30px 24px;
  max-width: 600px;
}
.divider { height: 1px; background: var(--border); margin-bottom: 24px; }
.res-title { font-family: var(--mono); font-size: 9px; font-weight: 500; letter-spacing: 0.12em; text-transform: uppercase; color: var(--text3); margin-bottom: 8px; }
.res-score-big {
  font-family: var(--sans);
  font-style: normal;
  font-size: 52px;
  font-weight: 800;
  color: var(--text);
  line-height: 1;
  letter-spacing: -0.04em;
  margin-bottom: 6px;
}
.res-grade { font-size: 13.5px; color: var(--text2); margin-bottom: 28px; }
.res-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; margin-bottom: 24px; }
.res-stat {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px;
  box-shadow: var(--shadow-xs);
}
.res-stat-n { font-family: var(--mono); font-size: 20px; font-weight: 600; color: var(--text); }
.res-stat-l { font-size: 10.5px; color: var(--text3); margin-top: 2px; }
.res-table { margin-bottom: 24px; border: 1px solid var(--border); border-radius: var(--radius-lg); overflow: hidden; box-shadow: var(--shadow-xs); }
.res-table-header {
  display: grid;
  grid-template-columns: 40px 1fr 80px 80px;
  padding: 8px 14px;
  background: var(--surface);
  font-family: var(--mono);
  font-size: 9.5px;
  font-weight: 500;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--text3);
  border-bottom: 1px solid var(--border);
}
.res-row {
  display: grid;
  grid-template-columns: 40px 1fr 80px 80px;
  padding: 8px 14px;
  font-size: 12px;
  color: var(--text2);
  border-bottom: 1px solid var(--border);
  align-items: center;
  background: var(--card);
}
.res-row:last-child { border-bottom: none; }
.res-row.correct { color: var(--green); }
.res-row.wrong   { color: var(--red); }

/* ── Analysis view ───────────────────────────────────────── */
#analysis-view {
  display: none;
  flex-direction: column;
  flex: 1;
  min-height: 0;
  overflow-y: auto;
}
#analysis-inner {
  max-width: 1100px;
  width: 100%;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  padding: 26px 24px;
  gap: 18px;
}
.analysis-header-eyebrow { font-family: var(--mono); font-size: 9px; font-weight: 500; letter-spacing: 0.12em; text-transform: uppercase; color: var(--text3); margin-bottom: 4px; }
.analysis-header-title { font-size: 19px; font-weight: 500; color: var(--text); letter-spacing: -0.02em; }
.analysis-section { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 18px 20px; box-shadow: var(--shadow-xs); }
.analysis-section-title { font-size: 12.5px; font-weight: 500; color: var(--text); margin-bottom: 12px; }
.analysis-row { display: flex; align-items: center; gap: 10px; padding: 6px 0; border-bottom: 1px solid var(--border); }
.analysis-row:last-child { border-bottom: none; }
.analysis-row-name { flex: 1; font-size: 13px; color: var(--text); }
.analysis-row-pct { font-family: var(--mono); font-size: 11.5px; font-weight: 600; }
.analysis-bar { width: 80px; height: 3px; background: var(--surface); border-radius: 99px; overflow: hidden; flex-shrink: 0; }
.analysis-fill { height: 100%; border-radius: 99px; }

/* ── Modals ──────────────────────────────────────────────── */
.rm-modal {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(16,15,20,0.50);
  z-index: 100;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
}
.rm-modal.visible { display: flex; }
.rm-modal-box {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 28px;
  max-width: 460px;
  width: 92%;
  max-height: 86vh;
  overflow-y: auto;
  box-shadow: var(--shadow-lg);
}
.rm-modal-title { font-size: 17px; font-weight: 500; color: var(--text); margin-bottom: 4px; letter-spacing: -0.01em; }
.rm-modal-sub { font-size: 12px; color: var(--text3); margin-bottom: 20px; line-height: 1.65; }
.rm-section-label { font-family: var(--mono); font-size: 9px; font-weight: 500; letter-spacing: 0.12em; text-transform: uppercase; color: var(--text3); margin-bottom: 8px; margin-top: 16px; }
.rm-topic-chip {
  padding: 4px 10px;
  font-size: 11px;
  font-family: var(--mono);
  font-weight: 500;
  color: var(--text2);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 99px;
  cursor: pointer;
  transition: all 0.1s;
}
.rm-topic-chip:hover { border-color: var(--border2); color: var(--text); }
.rm-topic-chip.sel { background: var(--accent-light); border-color: var(--accent-border); color: var(--accent); }
.rm-count-preview { font-size: 12px; color: var(--text3); margin-top: 8px; }
.rm-count-preview span { color: var(--accent); font-weight: 500; }
.rm-modal-actions { display: flex; gap: 8px; margin-top: 20px; justify-content: flex-end; }

.rm-year-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 6px; }
.rm-year-btn {
  padding: 6px 4px;
  font-family: var(--mono);
  font-size: 10.5px;
  font-weight: 500;
  color: var(--text3);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  cursor: pointer;
  transition: all 0.1s;
  text-align: center;
}
.rm-year-btn:hover { border-color: var(--border2); color: var(--text2); }
.rm-year-btn.sel { background: var(--accent-light); border-color: var(--accent-border); color: var(--accent); }
.rm-pts-row { display: flex; gap: 6px; flex-wrap: wrap; }
.rm-pts-btn {
  padding: 4px 12px;
  font-family: var(--mono);
  font-size: 10.5px;
  font-weight: 500;
  color: var(--text3);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  cursor: pointer;
  transition: all 0.1s;
}
.rm-pts-btn:hover { border-color: var(--border2); color: var(--text2); }
.rm-pts-btn.sel { background: var(--gold-light); border-color: #f0d49a; color: var(--gold); }

/* ── Frac / math widget ──────────────────────────────────── */
.frac-wrap { display: inline-flex; flex-direction: column; align-items: center; vertical-align: middle; margin: 0 2px; }
.frac-num, .frac-den { font-size: 0.85em; line-height: 1.2; text-align: center; }
.frac-line { width: 100%; height: 1px; background: currentColor; margin: 1px 0; }
.frac-mode-btn { font-family: var(--mono); font-size: 10px; color: var(--text3); background: none; border: 1px solid var(--border); border-radius: 4px; padding: 2px 6px; cursor: pointer; margin-left: 6px; transition: all 0.1s; }
.frac-mode-btn:hover { color: var(--accent); border-color: var(--accent-border); }
.frac-mode-btn.active { color: var(--accent); border-color: var(--accent-border); background: var(--accent-light); }
.frac-inputs { display: inline-flex; flex-direction: column; align-items: center; vertical-align: middle; margin: 0 2px; }
.frac-inp { width: 52px; font-family: var(--mono); font-size: 12px; text-align: center; border: 1px solid var(--border); border-radius: 4px; padding: 2px 4px; background: var(--card); color: var(--text); outline: none; }
.frac-inp:focus { border-color: var(--accent); }
.frac-bar { width: 100%; height: 1px; background: var(--border2); margin: 2px 0; }

/* Symbol keyboard */
.sym-kbd { display: flex; flex-wrap: wrap; gap: 4px; margin-top: 10px; }
.sym-btn { font-family: var(--mono); font-size: 11.5px; padding: 4px 9px; background: var(--card); border: 1px solid var(--border); border-radius: 5px; cursor: pointer; color: var(--text2); transition: all 0.1s; box-shadow: var(--shadow-xs); }
.sym-btn:hover { background: var(--accent-light); border-color: var(--accent-border); color: var(--accent); }

/* ── Math rendering ──────────────────────────────────────── */
.math-display { display: block; text-align: center; padding: 12px 0 8px; overflow-x: auto; scrollbar-width: thin; scrollbar-color: var(--border) transparent; }
.math-display .katex-display { overflow-x: auto; overflow-y: visible; margin: 0; scrollbar-width: thin; scrollbar-color: var(--border) transparent; }
.math-display .katex { font-size: 1.3em; }
.katex { color: var(--text); }
.katex-display { overflow-x: auto; overflow-y: visible; scrollbar-width: thin; scrollbar-color: var(--border) transparent; }
.math-display::-webkit-scrollbar,
.math-display .katex-display::-webkit-scrollbar,
.katex-display::-webkit-scrollbar { height: 3px; }
.math-display::-webkit-scrollbar-track,
.math-display .katex-display::-webkit-scrollbar-track,
.katex-display::-webkit-scrollbar-track { background: transparent; }
.math-display::-webkit-scrollbar-thumb,
.math-display .katex-display::-webkit-scrollbar-thumb,
.katex-display::-webkit-scrollbar-thumb { background: var(--border); border-radius: 99px; }
.q-text .katex { font-size: 1.05em; }

/* ── Graph tool ──────────────────────────────────────────── */
.sgt-wrap { display: flex; flex-direction: column; align-items: flex-start; font-family: var(--mono); }
.sgt-canvas { background: #0d1117; border: 1px solid #1e2335; border-radius: var(--radius); display: block; }
.sgt-coords { margin-top: 6px; font-size: 11px; color: #5b8ef0; height: 16px; }
.sgt-fn-row { display: flex; gap: 6px; margin-top: 8px; align-items: center; flex-wrap: wrap; }
.sgt-fn-input { background: #0d1117; border: 1px solid #1e2335; border-radius: 5px; color: #c9d1d9; font-family: inherit; font-size: 12px; padding: 5px 9px; outline: none; width: 190px; }
.sgt-fn-input:focus { border-color: #5b8ef0; }
.sgt-fn-input.error { border-color: #f56565; }
.sgt-fn-add { background: #5b8ef0; border: none; border-radius: 5px; color: #fff; font-family: inherit; font-size: 12px; padding: 5px 12px; cursor: pointer; white-space: nowrap; }
.sgt-fn-add:hover { background: #7aaaf5; }
.sgt-reset { background: none; border: 1px solid #1e2335; border-radius: 5px; color: #4d566d; font-family: inherit; font-size: 11px; padding: 3px 10px; cursor: pointer; }
.sgt-reset:hover { border-color: #4d566d; color: #8a94b0; }
.sgt-sp { background: #111827; border: 1px solid #1e2335; border-radius: 5px; color: #8a94b0; font-family: var(--mono); font-size: 11px; padding: 3px 8px; cursor: pointer; }
.sgt-sp:hover { border-color: #5b8ef0; color: #5b8ef0; }
.sgt-fn-list { margin-top: 8px; display: flex; flex-direction: column; gap: 4px; }
.sgt-fn-item { display: flex; align-items: center; gap: 6px; font-size: 11px; }
.sgt-fn-swatch { width: 8px; height: 8px; border-radius: 50%; flex-shrink: 0; }
.sgt-fn-expr { flex: 1; color: #c9d1d9; }
.sgt-fn-del { background: none; border: none; color: #4d566d; cursor: pointer; font-size: 14px; padding: 0 2px; line-height: 1; }
.sgt-fn-del:hover { color: #f56565; }
.sgt-fn-locked { background: none; border: none; color: #4d566d; font-size: 11px; padding: 0 2px; cursor: default; opacity: 0.5; }
.sgt-locked-note { margin-top: 8px; font-size: 10px; color: #4d566d; letter-spacing: 0.04em; }
.sgt-mode-btn { background: #111827; border: 1px solid #1e2335; border-radius: 5px; color: #8a94b0; font-family: inherit; font-size: 11px; padding: 4px 10px; cursor: pointer; }
.sgt-mode-btn:hover { border-color: #5b8ef0; color: #5b8ef0; }
.sgt-mode-active { background: #1a2640 !important; border-color: #5b8ef0 !important; color: #5b8ef0 !important; }

/* ── Welcome (hidden) ────────────────────────────────────── */
#welcome { display: none !important; }

/* ── Valemid tree toggle ─────────────────────────────────── */
.tv-title-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 14px;
}
.tv-title-row .tv-title { margin-bottom: 0; }

.val-tree-toggle-btn {
  display: none;
  align-items: center;
  gap: 5px;
  padding: 5px 11px;
  font-size: 12px;
  font-weight: 500;
  font-family: var(--sans);
  color: var(--text2);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  cursor: pointer;
  white-space: nowrap;
  transition: background 0.12s, border-color 0.12s;
  flex-shrink: 0;
}
.val-tree-toggle-btn:hover { background: var(--surface2); }
.val-tree-toggle-btn svg { width: 13px; height: 13px; flex-shrink: 0; }

#val-tree-backdrop {
  display: none;
  position: absolute;
  inset: 0;
  background: rgba(14, 18, 31, 0.38);
  backdrop-filter: blur(2px);
  z-index: 49;
}

/* ── Exam overflow menu (mobile only) ───────────────────── */
.exam-more-wrap { display: none; position: relative; }

.exam-more-btn {
  width: 36px;
  height: 36px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text2);
  cursor: pointer;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: background 0.13s, border-color 0.13s;
}
.exam-more-btn:hover { background: var(--surface2); border-color: var(--border2); }
.exam-more-btn svg { width: 16px; height: 16px; }

.exam-more-menu {
  display: none;
  position: absolute;
  top: calc(100% + 6px);
  right: 0;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  z-index: 90;
  min-width: 180px;
  overflow: hidden;
}
.exam-more-menu.open { display: block; }

.exam-more-item {
  display: flex;
  align-items: center;
  width: 100%;
  padding: 11px 14px;
  font-family: var(--sans);
  font-size: 13px;
  color: var(--text);
  background: none;
  border: none;
  cursor: pointer;
  text-align: left;
  transition: background 0.12s;
  white-space: nowrap;
}
.exam-more-item:hover { background: var(--surface); }
.exam-more-item + .exam-more-item { border-top: 1px solid var(--border); }

/* ── Responsive ──────────────────────────────────────────── */
@media (max-width: 900px) {
  body {
    overflow: hidden;
  }

  #mobile-topbar,
  #mobile-sidebar-backdrop {
    display: flex;
  }

  #mobile-sidebar-backdrop {
    display: block;
  }

  #sidebar {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: min(86vw, 320px);
    max-width: 320px;
    height: 100dvh;
    z-index: 50;
    box-shadow: var(--shadow-lg);
    transform: translateX(-100%);
    transition: transform 0.24s ease;
  }

  body.mobile-sidebar-open #sidebar {
    transform: translateX(0);
  }

  body.mobile-sidebar-open #mobile-sidebar-backdrop {
    opacity: 1;
    pointer-events: auto;
  }

  #main {
    width: 100%;
    height: 100vh;
    height: 100dvh;
  }

  /* Mobile app shell: bottom navigation replaces the desktop sidebar. */
  #sidebar {
    display: none;
  }

  #mobile-sidebar-backdrop {
    display: none !important;
  }

  #mobile-topbar {
    min-height: var(--mobile-topbar-height);
    padding: var(--mobile-topbar-safe) 14px 10px;
    background: rgba(255,255,255,0.88);
    border-bottom-color: rgba(15,23,42,0.08);
    box-shadow: 0 1px 0 rgba(15,23,42,0.04);
    z-index: 24;
  }

  body.mobile-in-exam #mobile-topbar,
  body.mobile-in-exam #mobile-bottom-nav {
    display: none;
  }

  #mobile-bottom-nav {
    position: fixed;
    left: 10px;
    right: 10px;
    bottom: 8px;
    z-index: 42;
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 2px;
    padding: 7px 7px calc(7px + env(safe-area-inset-bottom, 0px));
    background: rgba(255,255,255,0.92);
    border: 1px solid rgba(15,23,42,0.08);
    border-radius: 18px;
    box-shadow: 0 18px 50px rgba(15,23,42,0.16);
    backdrop-filter: blur(18px);
  }

  .mobile-nav-item {
    min-width: 0;
    height: 50px;
    border: 0;
    border-radius: 13px;
    background: transparent;
    color: var(--text3);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 3px;
    font-size: 10px;
    font-weight: 700;
    line-height: 1;
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
  }

  .mobile-nav-item svg {
    width: 20px;
    height: 20px;
    stroke-width: 2.1;
  }

  .mobile-nav-item.active {
    color: var(--accent);
    background: var(--accent-subtle);
  }

  #mobile-more-backdrop {
    position: fixed;
    inset: 0;
    z-index: 60;
    display: block;
    background: rgba(15,23,42,0.34);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.18s ease;
  }

  #mobile-more-sheet {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 61;
    display: block;
    padding: 8px 16px calc(18px + env(safe-area-inset-bottom, 0px));
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 22px 22px 0 0;
    box-shadow: 0 -24px 70px rgba(15,23,42,0.2);
    transform: translateY(106%);
    transition: transform 0.24s cubic-bezier(.2,.8,.2,1);
  }

  body.mobile-more-open #mobile-more-backdrop {
    opacity: 1;
    pointer-events: auto;
  }

  body.mobile-more-open #mobile-more-sheet {
    transform: translateY(0);
  }

  .mobile-sheet-handle {
    width: 40px;
    height: 4px;
    border-radius: 999px;
    background: var(--border2);
    margin: 2px auto 14px;
  }

  .mobile-sheet-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    margin-bottom: 12px;
  }

  .mobile-sheet-eyebrow {
    font-family: var(--mono);
    font-size: 10px;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--accent);
  }

  .mobile-sheet-title {
    margin-top: 2px;
    color: var(--text);
    font-size: 20px;
    font-weight: 800;
    letter-spacing: 0;
  }

  .mobile-sheet-close {
    width: 42px;
    height: 42px;
    border-radius: 12px;
    border: 1px solid var(--border);
    background: var(--surface);
    color: var(--text2);
    font-size: 22px;
    line-height: 1;
  }

  .mobile-course-toggle {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4px;
    padding: 4px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    margin-bottom: 12px;
  }

  .mobile-course-toggle button {
    height: 38px;
    border: 0;
    border-radius: 9px;
    background: transparent;
    color: var(--text2);
    font-weight: 800;
  }

  .mobile-course-toggle button.active {
    background: var(--accent);
    color: #fff;
    box-shadow: 0 6px 16px rgba(37,99,235,0.22);
  }

  .mobile-course-toggle button.locked {
    opacity: 0.46;
  }

  .mobile-sheet-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px;
  }

  .mobile-sheet-grid button,
  .mobile-sheet-actions button {
    border: 1px solid var(--border);
    background: var(--surface);
    color: var(--text);
    border-radius: 14px;
    min-height: 58px;
    font-weight: 800;
  }

  .mobile-sheet-grid button {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px;
    text-align: left;
  }

  .mobile-sheet-grid span {
    width: 34px;
    height: 34px;
    border-radius: 10px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: var(--accent-subtle);
    color: var(--accent);
    flex-shrink: 0;
  }

  .mobile-sheet-actions {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    margin-top: 10px;
  }

  .mobile-sheet-actions button.danger {
    color: var(--red);
    background: var(--red-light);
  }

  .tv-body { grid-template-columns: 1fr; }

  .exam-header {
    flex-direction: row;
    align-items: center;
    padding: 8px 12px;
    gap: 8px;
  }

  .eh-title {
    font-size: 12px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }

  .eh-right {
    width: auto;
    flex-wrap: nowrap;
    justify-content: flex-end;
    gap: 6px;
  }

  .exam-sec {
    display: none !important;
  }

  .exam-more-wrap {
    display: flex;
  }

  .exam-more-menu {
    position: fixed;
    top: var(--exam-more-top, calc(58px + env(safe-area-inset-top, 0px)));
    right: var(--exam-more-right, 12px);
    z-index: 460;
    width: max-content;
    min-width: 184px;
    max-width: calc(100vw - 24px);
    max-height: calc(100dvh - var(--exam-more-top, 58px) - 12px);
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
  }

  .eh-right .btn,
  .eh-right #sim-stop-btn,
  .eh-right #submit-btn {
    flex: 0 0 auto;
  }

  .part-tabs {
    overflow-x: auto;
    overflow-y: hidden;
    padding: 0 14px;
    scrollbar-width: none;
  }

  .part-tabs::-webkit-scrollbar,
  .q-nav::-webkit-scrollbar {
    display: none;
  }

  .part-tab {
    flex: 0 0 auto;
    white-space: nowrap;
  }

  .q-nav {
    flex-wrap: nowrap;
    overflow-x: auto;
    overflow-y: hidden;
    padding: 10px 14px;
    scrollbar-width: none;
  }

  .q-area {
    padding: 16px 14px 112px;
  }

  .exam-workspace {
    position: relative;
  }

  .tahvel-resizer {
    display: none !important;
  }

  .tahvel-panel {
    position: absolute;
    inset: 0;
    z-index: 35;
    width: auto;
    min-width: 0;
    max-width: none;
    flex-basis: auto;
  }

  .tahvel-topbar {
    min-height: 74px;
    padding: 0 10px;
  }

  .tahvel-fn-top {
    grid-template-columns: minmax(110px, 1fr) auto;
    margin-right: 0;
  }

  .tahvel-fn-chips {
    display: none;
  }

  .tahvel-toolbar {
    bottom: 14px;
    max-width: calc(100% - 20px);
  }

  .q-area-inner {
    max-width: none;
  }

  .q-text {
    font-size: 14px;
    line-height: 1.7;
  }

  .subpart-header,
  .subpart-body {
    padding-left: 14px;
    padding-right: 14px;
  }

  .ans-input-wrap {
    flex-direction: column;
    align-items: stretch;
    gap: 8px;
  }

  .ans-num,
  .ans-text,
  textarea.ans-text {
    width: 100%;
    max-width: 100%;
  }

  .choice {
    max-width: none;
  }

  .submit-row {
    position: sticky;
    bottom: 0;
    z-index: 18;
    flex-direction: column-reverse;
    align-items: stretch;
    padding: 12px 14px calc(14px + env(safe-area-inset-bottom, 0));
    gap: 10px;
    box-shadow: 0 -10px 24px rgba(0, 0, 0, 0.06);
  }

  .nav-btns {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
  }

  .nav-btns .btn,
  .submit-row > .btn,
  #submit-btn {
    width: 100%;
  }

  .q-counter {
    text-align: center;
  }

  .topic-mode-banner,
  .rm-banner {
    padding-left: 14px;
    padding-right: 14px;
    flex-wrap: wrap;
  }

  .rm-progress-bar {
    min-width: 120px;
  }

  .tv-header,
  .exams-header {
    padding: 16px 14px 14px;
  }

  #topic-panel,
  #exam-panel,
  #sb-topic-list,
  .sb-exams {
    display: none !important;
  }

  .tv-title,
  .exams-title {
    font-size: 17px;
    margin-bottom: 10px;
  }

  .tv-controls {
    flex-direction: column;
    align-items: stretch;
  }

  .tv-search {
    max-width: none;
    width: 100%;
  }

  .tv-body,
  #exams-grid {
    padding: 14px 14px calc(160px + env(safe-area-inset-bottom, 0px));
    grid-template-columns: 1fr;
    gap: 10px;
  }

  .tv-card-btn {
    flex-wrap: wrap;
  }

  .tv-card-btn .btn {
    flex: 1 1 100%;
    justify-content: center;
  }

  .th-scroll-body {
    padding-bottom: calc(160px + env(safe-area-inset-bottom, 0px));
  }

  .th-header,
  .th-body,
  .th-footer {
    padding-left: 14px;
    padding-right: 14px;
  }

  .th-grid {
    grid-template-columns: 1fr;
    gap: 10px;
  }

  .th-topic-card {
    padding: 18px 16px;
  }

  #results-view { padding: 18px 14px calc(160px + env(safe-area-inset-bottom, 0px)); }
  #analysis-inner {
    padding: 18px 14px calc(160px + env(safe-area-inset-bottom, 0px));
    max-width: none;
  }

  #study-content {
    padding: 16px 14px calc(160px + env(safe-area-inset-bottom, 0px));
  }

  .res-score-big {
    font-size: 42px;
  }

  .res-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .res-table {
    overflow-x: auto;
  }

  .res-table-header,
  .res-row {
    min-width: 420px;
  }

  .rm-modal,
  #manual-modal,
  #progress-modal,
  #sub-modal {
    padding: 12px;
  }

  .rm-modal-box,
  #manual-modal > div,
  #progress-modal .rm-modal-box,
  #sub-modal .settings-panel {
    width: min(100%, 520px);
    max-height: min(88dvh, 860px);
    overflow-y: auto;
  }

  .rm-modal-actions {
    flex-direction: column-reverse;
    align-items: stretch;
  }

  .rm-modal-actions .btn {
    width: 100%;
  }

  .settings-overlay {
    padding: 12px;
  }

  .settings-panel {
    width: min(100vw - 24px, 420px);
    max-height: min(92dvh, 820px);
  }

  .self-assess-btns {
    flex-direction: column;
  }

  .sgt-wrap,
  .sgt-canvas,
  .sgt-fn-row,
  .sgt-fn-input {
    max-width: 100%;
  }

  .sgt-wrap {
    width: 100%;
  }

  .sgt-fn-row {
    align-items: stretch;
  }

  .sgt-fn-input {
    width: 100%;
  }

  canvas,
  svg,
  img {
    max-width: 100%;
    height: auto;
  }

  /* Sidebar footer safe area */
  .sb-footer {
    padding-bottom: calc(10px + env(safe-area-inset-bottom, 0px));
  }

  /* Sidebar topic list bottom breathing room */
  #sb-topic-list {
    padding-bottom: calc(8px + env(safe-area-inset-bottom, 0px));
  }
  .sb-exams {
    padding-bottom: calc(8px + env(safe-area-inset-bottom, 0px));
  }

  /* Valemid tree toggle visible on mobile */
  .val-tree-toggle-btn {
    display: inline-flex;
  }

  /* Valemid body: needs position:relative for absolute drawer */
  #valemid-body {
    position: relative;
  }

  /* val-tree becomes a slide-in drawer */
  #val-tree {
    position: absolute !important;
    width: min(78vw, 280px) !important;
    top: 0;
    left: 0;
    bottom: 0;
    z-index: 50;
    transform: translateX(-100%);
    transition: transform 0.26s ease;
    box-shadow: 4px 0 20px rgba(0, 0, 0, 0.16);
    padding-bottom: calc(24px + env(safe-area-inset-bottom, 0px)) !important;
  }

  body.val-tree-open #val-tree {
    transform: translateX(0);
  }

  body.val-tree-open #val-tree-backdrop {
    display: block;
  }

  /* val-content full width on mobile, safe area at bottom */
  #val-content {
    padding: 16px 14px calc(160px + env(safe-area-inset-bottom, 0px)) !important;
  }

  /* iOS scroll containment for nested scrollable views */
  .tv-scroll-body,
  .exams-scroll-body,
  .th-scroll-body,
  #sb-topic-list,
  .sb-exams,
  #analysis-view,
  #results-view,
  .q-area {
    -webkit-overflow-scrolling: touch;
    overscroll-behavior: contain;
  }
}

/* ── Sidebar theory search ───────────────────────────────── */
.sb-search-wrap {
  padding: 8px 8px 4px;
  position: relative;
}
.sb-search-inner {
  display: flex;
  align-items: center;
  gap: 6px;
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--sb-border);
  border-radius: 6px;
  padding: 6px 8px;
  transition: border-color 0.15s, background 0.15s;
}
.sb-search-inner:focus-within {
  border-color: rgba(99,130,255,0.45);
  background: rgba(99,130,255,0.05);
}
.sb-search-inner:focus-within .sb-search-kbd { opacity: 0; }
.sb-search-input {
  flex: 1;
  min-width: 0;
  background: none;
  border: none;
  outline: none;
  font-size: 12px;
  color: var(--sb-text);
  font-family: var(--sans);
  line-height: 1;
}
.sb-search-input::placeholder { color: var(--sb-text-dim); }
.sb-search-kbd {
  font-family: var(--mono);
  font-size: 9px;
  color: var(--sb-text-dim);
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--sb-border);
  border-radius: 3px;
  padding: 1px 4px;
  flex-shrink: 0;
  pointer-events: none;
  transition: opacity 0.15s;
}
.sb-search-results {
  position: absolute;
  top: calc(100% - 4px);
  left: 8px;
  right: 8px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: var(--shadow-lg);
  z-index: 200;
  display: none;
  max-height: 340px;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: #1a2845 transparent;
}
.sb-search-results.open { display: block; }
.sb-search-result {
  padding: 9px 12px;
  cursor: pointer;
  border-bottom: 1px solid var(--border);
  transition: background 0.1s;
}
.sb-search-result:last-child { border-bottom: none; }
.sb-search-result:hover,
.sb-search-result.focused { background: var(--accent-light); }
.sb-search-result-topic {
  font-size: 10px;
  font-family: var(--mono);
  color: var(--accent);
  letter-spacing: 0.06em;
  margin-bottom: 2px;
  text-transform: uppercase;
}
.sb-search-result-heading {
  font-size: 12.5px;
  font-weight: 500;
  color: var(--text);
  margin-bottom: 3px;
  line-height: 1.3;
}
.sb-search-result-snippet {
  font-size: 11px;
  color: var(--text3);
  line-height: 1.45;
  overflow: hidden;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}
.sb-search-result-snippet mark,
.sb-search-result-heading mark {
  background: rgba(99,130,255,0.18);
  color: inherit;
  border-radius: 2px;
  padding: 0 1px;
  font-style: normal;
}
.sb-search-empty {
  padding: 14px 14px;
  font-size: 12px;
  color: var(--text3);
  font-family: var(--sans);
}
/* Section highlight flash on navigation */
@keyframes av-gauge-pulse {
  0%   { filter: inherit; }
  40%  { filter: brightness(1.3) drop-shadow(0 0 8px currentColor); }
  100% { filter: inherit; }
}
.av-gauge-pulse {
  animation: av-gauge-pulse 0.6s ease-out forwards;
}

@keyframes th-section-flash {
  0%   { background: transparent; }
  15%  { background: rgba(99,130,255,0.1); border-radius: 8px; }
  100% { background: transparent; }
}
.th-section--highlight { animation: th-section-flash 1.8s ease; }

/* ── Dark mode ───────────────────────────────────────────── */
html[data-theme="dark"] {
  --bg:       #111018;
  --surface:  #1a1727;
  --surface2: #1f1c2e;
  --card:     #181525;
  --border:   rgba(255,255,255,0.08);
  --border2:  rgba(255,255,255,0.14);

  --text:     #e4e1f0;
  --text2:    #9994b0;
  --text3:    #5a566e;

  /* Aliases stay in sync */
  --text-primary:   #e4e1f0;
  --text-secondary: #9994b0;
  --text-tertiary:  #5a566e;
  --divider:        rgba(255,255,255,0.08);
  --surface-hover:  #1f1c2e;

  --accent-light:  rgba(37,99,235,0.18);
  --accent-subtle: rgba(37,99,235,0.10);
  --accent-border: rgba(37,99,235,0.35);

  --green-light: rgba(34,197,94,0.14);
  --red-light:   rgba(239,68,68,0.14);
  --gold-light:  rgba(245,158,11,0.14);

  --success-light: rgba(34,197,94,0.14);
  --error-light:   rgba(239,68,68,0.14);
  --warning-light: rgba(245,158,11,0.14);

  --shadow-xs: 0 1px 2px rgba(0,0,0,0.4);
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.45);
  --shadow:    0 2px 8px rgba(0,0,0,0.5), 0 1px 2px rgba(0,0,0,0.35);
  --shadow-md: 0 2px 8px rgba(0,0,0,0.5), 0 1px 2px rgba(0,0,0,0.35);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.6), 0 2px 4px rgba(0,0,0,0.4);

  --sb-bg:        #13111a;
  --sb-text:      #9a95a8;
  --sb-text-dim:  rgba(154,149,168,0.45);
  --sb-border:    rgba(255,255,255,0.07);
  --sb-hover:     rgba(255,255,255,0.05);
  --sb-active-bg: #1a2845;
  --sb-active:    #93c5fd;
  --sb-text-hover:#d4d0e0;
}

/* Dark mode component overrides — hardcoded colors that need inverting */
html[data-theme="dark"] .feedback.ok  { color: #86efac; }
html[data-theme="dark"] .feedback.no  { color: #fca5a5; }
html[data-theme="dark"] .feedback.unknown { color: var(--text); }
html[data-theme="dark"] .feedback-grading { border-top-color: rgba(255,255,255,0.08); }
html[data-theme="dark"] .choice.c-ok  { color: #86efac; }
html[data-theme="dark"] .sa-btn-ok { color: #86efac; border-color: rgba(34,197,94,0.3); background: rgba(34,197,94,0.1); }
html[data-theme="dark"] .sa-btn-ok:hover { background: rgba(34,197,94,0.18); border-color: rgba(34,197,94,0.5); }
html[data-theme="dark"] .sa-btn-no { color: #fca5a5; border-color: rgba(239,68,68,0.3); background: rgba(239,68,68,0.1); }
html[data-theme="dark"] .sa-btn-no:hover { background: rgba(239,68,68,0.18); border-color: rgba(239,68,68,0.5); }
html[data-theme="dark"] .hint-body  { border-color: rgba(245,158,11,0.22); border-left-color: var(--gold); }
html[data-theme="dark"] .hint-box   { border-color: rgba(245,158,11,0.22); border-left-color: var(--gold); }
html[data-theme="dark"] .rm-pts-btn.sel { border-color: rgba(245,158,11,0.3); }
html[data-theme="dark"] .subpart.checked-correct { border-color: rgba(34,197,94,0.35); }
html[data-theme="dark"] .subpart.checked-wrong   { border-color: rgba(239,68,68,0.35); }
html[data-theme="dark"] .tv-topic-card.tv-active { box-shadow: 0 0 0 3px rgba(37,99,235,0.15), var(--shadow-sm); }
html[data-theme="dark"] .q-dot.active { box-shadow: 0 2px 8px rgba(37,99,235,0.2); }
html[data-theme="dark"] .q-dot.correct { box-shadow: 0 1px 4px rgba(34,197,94,0.15); }
html[data-theme="dark"] .q-dot.wrong { box-shadow: 0 1px 4px rgba(239,68,68,0.15); }
html[data-theme="dark"] .sb-exam-item.done { color: #4ade80; }

/* ── Color schemes ───────────────────────────────────────── */
html[data-color-scheme="green"] {
  --accent:        #16a34a;
  --accent-hover:  #15803d;
  --accent-light:  #dcfce7;
  --accent-subtle: #f0fdf4;
  --accent-border: rgba(22,163,74,0.25);
  --sb-active-bg:  #dcfce7;
  --sb-active:     #16a34a;
}
html[data-color-scheme="green"][data-theme="dark"] {
  --accent-light:  rgba(22,163,74,0.18);
  --accent-subtle: rgba(22,163,74,0.10);
  --accent-border: rgba(22,163,74,0.35);
  --sb-active-bg:  rgba(22,163,74,0.15);
  --sb-active:     #4ade80;
}
html[data-color-scheme="purple"] {
  --accent:        #7c3aed;
  --accent-hover:  #6d28d9;
  --accent-light:  #ede9fe;
  --accent-subtle: #f5f3ff;
  --accent-border: rgba(124,58,237,0.25);
  --sb-active-bg:  #ede9fe;
  --sb-active:     #7c3aed;
}
html[data-color-scheme="purple"][data-theme="dark"] {
  --accent-light:  rgba(124,58,237,0.18);
  --accent-subtle: rgba(124,58,237,0.10);
  --accent-border: rgba(124,58,237,0.35);
  --sb-active-bg:  rgba(124,58,237,0.15);
  --sb-active:     #a78bfa;
}
html[data-color-scheme="rose"] {
  --accent:        #e11d48;
  --accent-hover:  #be123c;
  --accent-light:  #ffe4e6;
  --accent-subtle: #fff1f2;
  --accent-border: rgba(225,29,72,0.25);
  --sb-active-bg:  #ffe4e6;
  --sb-active:     #e11d48;
}
html[data-color-scheme="rose"][data-theme="dark"] {
  --accent-light:  rgba(225,29,72,0.18);
  --accent-subtle: rgba(225,29,72,0.10);
  --accent-border: rgba(225,29,72,0.35);
  --sb-active-bg:  rgba(225,29,72,0.15);
  --sb-active:     #fb7185;
}

/* ── Zoom levels ──────────────────────────────────────────── */
html[data-zoom="small"] body  { zoom: 0.85; }
html[data-zoom="large"]  body { zoom: 1.15; }

@media (max-width: 900px) {
  html[data-zoom="small"] body,
  html[data-zoom="large"] body {
    zoom: 1;
  }
}

/* ── Sidebar position ─────────────────────────────────────── */
html[data-sidebar-pos="right"] body { flex-direction: row-reverse; }

/* ── Custom scrollbar — test topic list ─────────────────── */
.test-topic-scroll { scrollbar-width: thin; scrollbar-color: var(--border2) transparent; }
.test-topic-scroll::-webkit-scrollbar { width: 4px; }
.test-topic-scroll::-webkit-scrollbar-track { background: transparent; }
.test-topic-scroll::-webkit-scrollbar-thumb { background: var(--border2); border-radius: 99px; }
.test-topic-scroll::-webkit-scrollbar-thumb:hover { background: var(--text3); }

/* ── Settings panel ──────────────────────────────────────── */
.settings-overlay {
  position: fixed;
  inset: 0;
  z-index: 500;
  background: rgba(0,0,0,0.5);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  display: flex;
  align-items: center;
  justify-content: center;
}
.settings-panel {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 28px;
  width: 320px;
  box-shadow: var(--shadow-lg);
}
.settings-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
}
.settings-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--text);
  letter-spacing: -0.02em;
}
.settings-close-btn {
  width: 28px; height: 28px;
  display: flex; align-items: center; justify-content: center;
  background: none; border: none;
  border-radius: 6px; cursor: pointer;
  color: var(--text3); font-size: 18px;
  transition: all 0.1s;
}
.settings-close-btn:hover { background: var(--surface); color: var(--text2); }

.settings-account-btn {
  width: 100%;
  padding: 9px 12px;
  font-size: 13px;
  font-family: var(--sans);
  font-weight: 500;
  color: var(--text2);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  cursor: pointer;
  text-align: left;
  transition: all 0.15s;
}
.settings-account-btn:hover { background: var(--surface2, var(--bg)); color: var(--text); }

.settings-section-label {
  font-family: var(--mono);
  font-size: 9.5px;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text3);
  margin-bottom: 10px;
}
.theme-options {
  display: flex;
  gap: 8px;
}
.theme-option {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  padding: 16px 10px;
  border: 1.5px solid var(--border);
  border-radius: 12px;
  cursor: pointer;
  transition: all 0.13s;
  background: var(--surface);
  font-family: var(--sans);
}
.theme-option:hover { border-color: var(--accent-border); background: var(--accent-subtle); }
.theme-option.selected { border-color: var(--accent); background: var(--accent-subtle); }
.theme-opt-icon { font-size: 22px; line-height: 1; }
.theme-opt-label { font-size: 12px; font-weight: 500; color: var(--text2); }
.theme-option.selected .theme-opt-label { color: var(--accent); }

/* Settings section divider */
.settings-divider {
  height: 1px;
  background: var(--border);
  margin: 20px 0 18px;
}

/* Color scheme picker */
.color-scheme-options {
  display: flex;
  gap: 6px;
}
.color-scheme-opt {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 7px;
  padding: 12px 6px;
  border: 1.5px solid var(--border);
  border-radius: 12px;
  cursor: pointer;
  transition: all 0.13s;
  background: var(--surface);
  font-family: var(--sans);
}
.color-scheme-opt:hover { border-color: var(--accent-border); background: var(--accent-subtle); }
.color-scheme-opt.selected { border-color: var(--accent); background: var(--accent-subtle); }
.cs-dot {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  flex-shrink: 0;
  box-shadow: 0 1px 3px rgba(0,0,0,0.2);
}
.cs-label { font-size: 10.5px; font-weight: 500; color: var(--text2); }
.color-scheme-opt.selected .cs-label { color: var(--accent); }

/* Zoom picker */
.zoom-options {
  display: flex;
  gap: 8px;
}
.zoom-opt {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 14px 10px;
  border: 1.5px solid var(--border);
  border-radius: 12px;
  cursor: pointer;
  transition: all 0.13s;
  background: var(--surface);
  font-family: var(--sans);
}
.zoom-opt:hover { border-color: var(--accent-border); background: var(--accent-subtle); }
.zoom-opt.selected { border-color: var(--accent); background: var(--accent-subtle); }
.zoom-opt-icon { font-weight: 700; color: var(--text); line-height: 1; }
.zoom-opt-label { font-size: 11px; font-weight: 500; color: var(--text2); }
.zoom-opt.selected .zoom-opt-label { color: var(--accent); }
.zoom-opt.selected .zoom-opt-icon { color: var(--accent); }

/* Sidebar position picker */
.sidebar-pos-options {
  display: flex;
  gap: 8px;
}
.sidebar-pos-opt {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  padding: 14px 10px;
  border: 1.5px solid var(--border);
  border-radius: 12px;
  cursor: pointer;
  transition: all 0.13s;
  background: var(--surface);
  font-family: var(--sans);
}
.sidebar-pos-opt:hover { border-color: var(--accent-border); background: var(--accent-subtle); }
.sidebar-pos-opt.selected { border-color: var(--accent); background: var(--accent-subtle); }
.sbpos-icon {
  display: flex;
  gap: 3px;
  width: 40px;
  height: 26px;
  border-radius: 4px;
  overflow: hidden;
  border: 1.5px solid var(--border2);
  background: var(--bg);
}
.sbpos-bar {
  background: var(--accent);
  opacity: 0.75;
  flex-shrink: 0;
  width: 12px;
}
.sbpos-fill {
  flex: 1;
  background: var(--border);
}
.sbpos-label { font-size: 11px; font-weight: 500; color: var(--text2); }
.sidebar-pos-opt.selected .sbpos-label { color: var(--accent); }
.sidebar-pos-opt.selected .sbpos-bar { opacity: 1; }

/* Wider settings panel to fit all sections */
.settings-panel { width: 360px; }

/* Sidebar footer icon button */
.sb-footer-icon-btn {
  width: 30px;
  height: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  color: rgba(154,149,168,0.45);
  transition: all 0.15s;
  flex-shrink: 0;
}
.sb-footer-icon-btn:hover { color: var(--sb-text); background: var(--sb-hover); }

/* ── Võrrandisüsteemi sisestus ─────────────────────────────── */
.system-input-wrap {
  display: flex;
  align-items: stretch;
  gap: 0;
  margin-top: 6px;
}
.system-brace {
  font-size: 52px;
  line-height: 1;
  color: var(--accent);
  font-weight: 300;
  padding-right: 10px;
  display: flex;
  align-items: center;
  opacity: 0.7;
  font-family: 'Source Serif 4', serif;
  user-select: none;
}
.system-equations {
  display: flex;
  flex-direction: column;
  gap: 8px;
  flex: 1;
}
.system-eq-row {
  display: flex;
  align-items: center;
  gap: 8px;
}
.system-eq-label {
  font-family: var(--mono);
  font-size: 10px;
  color: var(--text3);
  min-width: 16px;
  user-select: none;
}
.system-eq-input {
  flex: 1;
  background: var(--bg);
  border: 2px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font-family: var(--mono);
  font-size: 13px;
  padding: 8px 12px;
  outline: none;
  transition: border-color 0.14s, box-shadow 0.14s;
  box-shadow: var(--shadow-xs);
}
.system-eq-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(37,99,235,0.12);
  background: var(--card);
}
.system-eq-input:disabled {
  opacity: 0.6;
  cursor: default;
}
.system-eq-input::placeholder {
  color: var(--text3);
  opacity: 0.7;
}

/* Markdown table */
.md-table {
  border-collapse: collapse;
  margin: 8px 0;
  font-size: 14px;
}
.md-table th,
.md-table td {
  border: 1px solid var(--border, #3a4255);
  padding: 6px 12px;
  text-align: left;
}
.md-table th {
  background: var(--card2, #1e2535);
  font-weight: 600;
}
.md-table tr:nth-child(even) td {
  background: var(--card2, #1e2535);
}


/* ========================================
   VALEMID — filter chips
   ======================================== */

/* ========================================
   VALEMID — left tree navigation
   ======================================== */
.val-ti {
  display: flex;
  align-items: center;
  gap: 7px;
  padding-top: 6px;
  padding-bottom: 6px;
  padding-right: 10px;
  cursor: pointer;
  font-size: 13px;
  line-height: 1.3;
  color: var(--sb-text);
  transition: background 0.1s, color 0.1s;
  user-select: none;
}
.val-ti:hover { background: var(--surface); color: var(--text); }

/* Chapter (depth 0, branch) */
.val-ti-ch {
  font-weight: 700;
  font-size: 12.5px;
  color: var(--text);
  letter-spacing: -0.01em;
  padding-top: 8px;
  padding-bottom: 8px;
  border-top: 1px solid var(--border);
}
.val-ti-ch:first-child { border-top: none; }
.val-ti-ch:hover { background: var(--surface); }

/* Section (depth 1, branch) */
.val-ti-sec {
  font-size: 12px;
  font-weight: 600;
  color: var(--text2);
}

/* Leaf (depth ≥ 1, has kategoriad) */
.val-ti-leaf { color: var(--sb-text); }

/* Selected leaf */
.val-ti-sel {
  background: var(--sb-active-bg) !important;
  color: var(--sb-active) !important;
  font-weight: 500;
}

/* Disabled (no formulas for current kursus) */
.val-ti-off { opacity: 0.35; cursor: default; }
.val-ti-off:hover { background: transparent; color: var(--sb-text); }

/* Chevron icons */
.val-chev {
  width: 6px;
  height: 10px;
  flex-shrink: 0;
  color: var(--text3);
  transition: transform 0.17s;
}
.val-chev.open { transform: rotate(90deg); }

/* Leaf dot indicator */
.val-dot {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  flex-shrink: 0;
  background: transparent;
  border: 1.5px solid var(--border2);
}
.val-dot-sel {
  background: var(--sb-active);
  border-color: var(--sb-active);
}

/* ========================================
   VALEMID — right content area
   ======================================== */
.val-content-wrap { padding-bottom: 40px; }

.val-breadcrumb {
  font-size: 10.5px;
  font-weight: 600;
  color: var(--text3);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 14px;
}

.val-subhead {
  font-size: 10.5px;
  font-weight: 600;
  color: var(--text3);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin: 18px 0 8px;
}

.val-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
  margin-bottom: 10px;
  box-shadow: var(--shadow-sm);
}

.val-row {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 9px 15px;
  min-height: 40px;
}
.val-row.sep { border-bottom: 1px solid var(--border); }

.val-fml {
  flex: 1;
  min-width: 0;
  overflow: visible;
  line-height: 1.6;
  /* KaTeX inherits correct fonts; plain-text fallback via .val-fml-txt */
}

/* Plain-text fallback (no LaTeX) */
.val-fml-txt {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12.5px;
  color: var(--text);
  line-height: 1.55;
}

/* Custom scrollbars for val-tree and val-content */
#val-tree, #val-content {
  scrollbar-width: thin;
  scrollbar-color: var(--border2) transparent;
}
#val-tree::-webkit-scrollbar,
#val-content::-webkit-scrollbar { width: 5px; }
#val-tree::-webkit-scrollbar-track,
#val-content::-webkit-scrollbar-track { background: transparent; }
#val-tree::-webkit-scrollbar-thumb,
#val-content::-webkit-scrollbar-thumb {
  background: var(--border2);
  border-radius: 99px;
}
#val-tree::-webkit-scrollbar-thumb:hover,
#val-content::-webkit-scrollbar-thumb:hover { background: var(--text3); }

/* Badges */
.val-badges { display: flex; gap: 4px; flex-shrink: 0; }
.val-badge {
  font-size: 10px;
  font-weight: 600;
  padding: 2px 7px;
  border-radius: 20px;
  white-space: nowrap;
  letter-spacing: 0.01em;
}
.val-badge-k { background: var(--accent-light); color: var(--accent); cursor: default; }
.val-badge-l { background: rgba(34,197,94,0.12); color: var(--green); cursor: default; }
.val-badge-rare {
  background: var(--surface2);
  color: var(--text3);
  cursor: default;
  position: relative;
}
.val-badge-rare::after {
  content: 'Väga tõenäoliselt ei lähe eksamis vaja';
  position: absolute;
  bottom: calc(100% + 7px);
  right: 0;
  background: var(--text);
  color: var(--bg);
  font-size: 11.5px;
  font-weight: 400;
  white-space: nowrap;
  padding: 5px 10px;
  border-radius: 7px;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.15s;
  z-index: 200;
}
.val-badge-rare:hover::after { opacity: 1; }

/* Search results path label */
.val-search-path {
  font-size: 10.5px;
  font-weight: 600;
  color: var(--text3);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding-bottom: 6px;
  margin: 20px 0 8px;
  border-bottom: 1px solid var(--border);
}

/* Highlight */
.val-hl {
  background: rgba(37,99,235,0.15);
  color: var(--accent);
  border-radius: 2px;
  padding: 0 1px;
}

/* Empty state */
.val-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 200px;
  color: var(--text3);
  font-size: 13.5px;
  text-align: center;
  gap: 2px;
}

/* Row group wrapper — handles separator border */
.val-rg { }
.val-rg.sep { border-bottom: 1px solid var(--border); }

/* ? context button */
.val-q {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  border: 1.5px solid var(--border2);
  background: transparent;
  color: var(--text3);
  font-size: 10px;
  font-weight: 700;
  font-family: inherit;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
}
.val-q:hover {
  background: var(--accent-light);
  border-color: var(--accent);
  color: var(--accent);
}
.val-q.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

/* Info / context panel */
.val-info {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.25s ease, border-color 0.25s;
  background: var(--surface);
  border-top: 0px solid var(--border);
}
.val-info.open {
  max-height: 240px;
  border-top-width: 1px;
}
.val-info-ctx {
  padding: 10px 15px 5px;
  font-size: 12.5px;
  color: var(--text2);
  line-height: 1.55;
}
.val-info-ex {
  padding: 2px 15px 11px;
  font-size: 12px;
  color: var(--text2);
  font-family: 'JetBrains Mono', monospace;
  line-height: 1.5;
}
.val-info-lbl {
  font-weight: 700;
  color: var(--accent);
  font-family: inherit;
  font-style: normal;
}

/* Erikulmad table wrapper */
.val-erikulmad-wrap {
  padding: 28px 20px;
  overflow-x: auto;
  display: flex;
  justify-content: center;
  font-size: 1.18em;
  scrollbar-width: thin;
  scrollbar-color: var(--border2) transparent;
}
.val-erikulmad-wrap::-webkit-scrollbar { height: 4px; }
.val-erikulmad-wrap::-webkit-scrollbar-thumb { background: var(--border2); border-radius: 99px; }

/* ========================================
   VALEMID — header action row (chips + buttons)
   ======================================== */
.val-actions {
  display: flex;
  align-items: center;
  gap: 5px;
  flex-wrap: wrap;
  margin-top: 8px;
}
.val-chip {
  display: inline-flex;
  align-items: center;
  font-size: 11.5px;
  font-weight: 500;
  padding: 4px 10px;
  border-radius: 20px;
  border: 1px solid var(--border2);
  background: var(--surface);
  color: var(--text2);
  cursor: pointer;
  transition: background 0.12s, color 0.12s, border-color 0.12s;
  font-family: inherit;
  white-space: nowrap;
  user-select: none;
}
.val-chip:hover { background: var(--surface2); color: var(--text); }
.val-chip-active {
  background: var(--accent-light);
  color: var(--accent);
  border-color: transparent;
  font-weight: 600;
}
.val-chip-sep {
  width: 1px;
  height: 16px;
  background: var(--border2);
  flex-shrink: 0;
  margin: 0 2px;
}
.val-fc-btn {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 11.5px;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: 20px;
  border: none;
  background: var(--accent);
  color: #fff;
  cursor: pointer;
  transition: background 0.12s;
  font-family: inherit;
  margin-left: auto;
  white-space: nowrap;
}
.val-fc-btn:hover { background: var(--accent-hover); }

/* ========================================
   ÕPPEKAARTIDE overlay
   ======================================== */
#val-fc-overlay {
  position: fixed;
  inset: 0;
  background: var(--bg);
  z-index: 500;
  display: none;
  flex-direction: column;
  overflow: hidden;
}
#val-fc-overlay.fc-open { display: flex; }

.fc-topbar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 20px;
  border-bottom: 1px solid var(--border);
  background: var(--card);
  flex-shrink: 0;
}
.fc-back-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text2);
  background: none;
  border: none;
  cursor: pointer;
  font-family: inherit;
  padding: 5px 10px;
  border-radius: 7px;
  transition: background 0.12s, color 0.12s;
  flex-shrink: 0;
}
.fc-back-btn:hover { background: var(--surface); color: var(--text); }
.fc-progress-bar {
  flex: 1;
  height: 5px;
  background: var(--surface2);
  border-radius: 3px;
  overflow: hidden;
}
.fc-progress-fill {
  height: 100%;
  background: var(--accent);
  border-radius: 3px;
  transition: width 0.3s;
  width: 0%;
}
.fc-counter {
  font-size: 12.5px;
  font-weight: 600;
  color: var(--text3);
  flex-shrink: 0;
  min-width: 44px;
  text-align: right;
}

/* Options screen */
.fc-opts-screen {
  flex: 1;
  overflow-y: auto;
  padding: 36px 24px 48px;
  display: flex;
  flex-direction: column;
  align-items: center;
}
.fc-opts-inner {
  width: 100%;
  max-width: 500px;
}
.fc-opts-title {
  font-size: 22px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 5px;
}
.fc-opts-sub {
  font-size: 13.5px;
  color: var(--text2);
  margin-bottom: 28px;
  line-height: 1.55;
}
.fc-sect-label {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--text3);
  margin-bottom: 8px;
}
.fc-opt-row {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 12px 14px;
  border-radius: 9px;
  background: var(--card);
  border: 1px solid var(--border);
  cursor: pointer;
  margin-bottom: 7px;
  transition: border-color 0.12s;
}
.fc-opt-row:hover { border-color: var(--border2); }
.fc-opt-row input[type="checkbox"] {
  appearance: none;
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  border: 2px solid var(--border2);
  border-radius: 5px;
  background: var(--surface2);
  cursor: pointer;
  margin-top: 1px;
  position: relative;
  transition: border-color 0.12s, background 0.12s;
}
.fc-opt-row input[type="checkbox"]:checked {
  background: var(--accent);
  border-color: var(--accent);
}
.fc-opt-row input[type="checkbox"]:checked::after {
  content: '';
  position: absolute;
  left: 4px;
  top: 1px;
  width: 6px;
  height: 10px;
  border: 2.5px solid #fff;
  border-top: none;
  border-left: none;
  transform: rotate(42deg);
}
.fc-opt-row-lbl { flex: 1; }
.fc-opt-row-lbl strong {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 2px;
}
.fc-opt-row-lbl span {
  font-size: 12px;
  color: var(--text2);
  line-height: 1.4;
}
.fc-count-tag {
  font-size: 11.5px;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 20px;
  background: var(--surface2);
  color: var(--text3);
  flex-shrink: 0;
  margin-top: 2px;
}
.fc-start-btn {
  width: 100%;
  padding: 14px;
  border-radius: 10px;
  background: var(--accent);
  color: #fff;
  border: none;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  font-family: inherit;
  margin-top: 24px;
  transition: background 0.12s;
}
.fc-start-btn:hover { background: var(--accent-hover); }

/* Card screen */
.fc-card-screen {
  flex: 1;
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 24px 20px;
  gap: 20px;
}
.fc-card-screen.fc-open { display: flex; }
.fc-card {
  width: 100%;
  max-width: 580px;
  min-height: 220px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: var(--shadow-lg);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 36px 32px;
  cursor: pointer;
  transition: box-shadow 0.15s, transform 0.15s;
  text-align: center;
  position: relative;
}
.fc-card:hover { box-shadow: 0 12px 32px rgba(0,0,0,0.1); }
.fc-card-cat {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--text3);
  margin-bottom: 18px;
}
.fc-card-fml {
  font-size: 1.1em;
  line-height: 1.8;
  color: var(--text);
}
.fc-card-tap {
  font-size: 11.5px;
  color: var(--text3);
  margin-top: 20px;
  display: flex;
  align-items: center;
  gap: 5px;
}
#fc-front {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 100%;
}
.fc-card-back {
  display: flex;
  flex-direction: column;
  gap: 10px;
  text-align: left;
  width: 100%;
}
.fc-card-ctx {
  font-size: 13px;
  color: var(--text2);
  line-height: 1.6;
  margin-bottom: 10px;
}
.fc-card-ex {
  font-size: 12px;
  color: var(--text2);
  font-family: 'JetBrains Mono', monospace;
  background: var(--surface);
  border-radius: 7px;
  padding: 10px 13px;
  line-height: 1.5;
}
.fc-card-ex-lbl {
  font-weight: 700;
  color: var(--accent);
  font-family: var(--sans);
  display: block;
  margin-bottom: 3px;
  font-size: 11px;
}
.fc-ans-btns {
  display: flex;
  gap: 12px;
  width: 100%;
  max-width: 580px;
}
.fc-ans-btn {
  flex: 1;
  padding: 13px;
  border-radius: 10px;
  border: none;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  font-family: inherit;
  transition: background 0.12s, transform 0.1s;
}
.fc-ans-btn:active { transform: scale(0.97); }
.fc-ans-no { background: rgba(239,68,68,0.1); color: var(--red); }
.fc-ans-no:hover { background: rgba(239,68,68,0.18); }
.fc-ans-yes { background: rgba(34,197,94,0.1); color: var(--green); }
.fc-ans-yes:hover { background: rgba(34,197,94,0.18); }
.fc-flip-note {
  font-size: 12px;
  color: var(--text3);
  text-align: center;
}

/* Done screen */
.fc-done-screen {
  flex: 1;
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 40px 24px;
  text-align: center;
  gap: 0;
}
.fc-done-screen.fc-open { display: flex; }
.fc-done-emoji { font-size: 52px; margin-bottom: 16px; line-height: 1; }
.fc-done-title { font-size: 24px; font-weight: 700; color: var(--text); margin-bottom: 8px; }
.fc-done-sub { font-size: 14px; color: var(--text2); margin-bottom: 10px; }
.fc-done-score {
  font-size: 38px;
  font-weight: 800;
  color: var(--accent);
  margin-bottom: 6px;
}
.fc-done-score-lbl { font-size: 13px; color: var(--text3); margin-bottom: 32px; }
.fc-done-btns { display: flex; gap: 10px; flex-wrap: wrap; justify-content: center; }
.fc-done-btn {
  padding: 11px 22px;
  border-radius: 8px;
  border: none;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  font-family: inherit;
  transition: background 0.12s;
}
.fc-done-primary { background: var(--accent); color: #fff; }
.fc-done-primary:hover { background: var(--accent-hover); }
.fc-done-secondary { background: var(--surface2); color: var(--text); }
.fc-done-secondary:hover { background: var(--border2); }

/* ========================================
   TÕENÄOSUS — sümbolite legend
   ======================================== */
.val-prob-legend {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 9px;
  padding: 12px 16px 14px;
  margin-bottom: 16px;
}
.val-prob-legend-title {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--text3);
  margin-bottom: 10px;
}
.val-prob-sym-row {
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-size: 13px;
  color: var(--text2);
  padding: 3px 0;
}
.val-prob-sym {
  font-family: 'JetBrains Mono', monospace;
  font-size: 15px;
  font-weight: 700;
  color: var(--text);
  min-width: 28px;
  flex-shrink: 0;
}

/* ========================================
   GEOMEETRIA KUJUNDID — SVG diagrammid valemite juures
   ======================================== */
.val-shape-wrap {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px 10px 12px;
  margin-bottom: 14px;
  display: flex;
  flex-wrap: wrap;
  gap: 18px 24px;
  justify-content: center;
  align-items: flex-start;
}
.val-shape-block {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 7px;
  color: var(--text);
}
.val-shape-title {
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--text3);
  text-align: center;
}
.val-shape-svg {
  overflow: visible;
  display: block;
}
.val-shape-svg text {
  font-family: 'Georgia', 'Times New Roman', serif;
  font-style: italic;
  font-size: 13px;
  fill: var(--text);
}
.val-shape-svg text.vs-sm {
  font-size: 11px;
  fill: var(--text2);
}
.val-shape-svg text.vs-lbl {
  font-size: 14px;
}

/* ========================================
   ÕPPEKAARTIDE — topic filter + back button + key hints
   ======================================== */
.fc-topic-actions {
  display: flex;
  gap: 6px;
  margin-bottom: 8px;
}
.fc-topic-action-btn {
  font-size: 11.5px;
  font-weight: 500;
  padding: 4px 10px;
  border-radius: 20px;
  border: 1px solid var(--border2);
  background: var(--surface);
  color: var(--text2);
  cursor: pointer;
  font-family: inherit;
  transition: background 0.12s;
}
.fc-topic-action-btn:hover { background: var(--surface2); }
.fc-ans-back {
  flex: 0 0 44px;
  background: var(--surface2);
  color: var(--text2);
  display: flex;
  align-items: center;
  justify-content: center;
}
.fc-ans-back:hover { background: var(--border2); }
.fc-key-hint {
  font-size: 10px;
  font-weight: 400;
  opacity: 0.6;
  margin-left: 4px;
  font-family: 'JetBrains Mono', monospace;
}

/* ========================================
   VALEMILEHT flat view
   ======================================== */
.val-leht-wrap {
  padding-bottom: 40px;
}
.val-leht-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 8px;
  margin-bottom: 8px;
}
.val-leht-fml {
  font-size: 1em;
  line-height: 1.7;
  color: var(--text);
  padding: 10px 15px;
}

/* ========================================
   ÕPPEKAARTIDE — blur/reveal formula
   ======================================== */
.fc-formula-box {
  width: 100%;
  text-align: center;
  transition: filter 0.3s ease;
  cursor: pointer;
  user-select: none;
}
.fc-formula-box.fc-blurred {
  filter: blur(7px);
  pointer-events: none;
}
.fc-reveal-tip {
  font-size: 12px;
  color: var(--text3);
  margin-top: 10px;
}
.fc-hint-area {
  font-size: 14px;
  font-family: 'JetBrains Mono', monospace;
  color: var(--text2);
  margin-bottom: 4px;
}
.fc-hint-lbl {
  font-weight: 600;
  color: var(--text);
}

/* ========================================
   ÕPPEKAARTIDE — context panel (outside card)
   ======================================== */
.fc-ctx-panel {
  width: 100%;
  max-width: 520px;
  flex-direction: column;
  gap: 0;
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
  background: var(--surface);
}
.fc-ctx-toggle {
  display: flex;
  align-items: center;
  gap: 6px;
  width: 100%;
  padding: 10px 14px;
  background: none;
  border: none;
  font-family: inherit;
  font-size: 13px;
  font-weight: 500;
  color: var(--text2);
  cursor: pointer;
  text-align: left;
  transition: background 0.12s;
}
.fc-ctx-toggle:hover { background: var(--surface2); }
.fc-ctx-content {
  padding: 10px 14px 14px;
  font-size: 13.5px;
  color: var(--text2);
  line-height: 1.6;
  border-top: 1px solid var(--border);
}

/* ── Formula modal ─────────────────────────────────────────── */
.q-formula-btn {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 3px 10px;
  border-radius: 99px;
  border: 1.5px solid var(--border);
  background: transparent;
  color: var(--text3);
  font-size: 10px;
  font-weight: 600;
  font-family: var(--mono);
  letter-spacing: 0.05em;
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s, background 0.15s;
}
.q-formula-btn:hover {
  color: var(--accent);
  border-color: var(--accent);
  background: rgba(99,102,241,0.07);
}
.formula-modal-overlay {
  position: fixed; inset: 0; z-index: 9999;
  background: rgba(0,0,0,0.55);
  display: flex; align-items: flex-start; justify-content: flex-end;
  padding: 16px;
  box-sizing: border-box;
  overflow: hidden;
}
.formula-modal-panel {
  background: var(--card);
  border: 1px solid var(--border-strong);
  border-radius: 16px;
  width: 100%; max-width: 380px;
  max-height: 100%;
  display: flex; flex-direction: column;
  box-shadow: 0 24px 64px rgba(0,0,0,0.5);
  overflow: hidden;
}
.formula-modal-head {
  display: flex; align-items: center; justify-content: space-between;
  padding: 16px 20px 12px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}
.formula-modal-title {
  font-size: 14px; font-weight: 700;
}
.formula-modal-topic {
  font-size: 11px; color: var(--text3); font-family: var(--mono);
  letter-spacing: 0.05em; margin-top: 2px;
}
.formula-modal-close {
  background: none; border: none; cursor: pointer;
  color: var(--text3); font-size: 20px; line-height: 1;
  padding: 0 4px;
  transition: color 0.12s;
}
.formula-modal-close:hover { color: var(--text); }
.formula-modal-body {
  overflow-y: auto;
  flex: 1;
  min-height: 0;
  padding: 14px 20px 20px;
}
.formula-group {
  margin-bottom: 18px;
}
.formula-group:last-child { margin-bottom: 0; }
.formula-group-label {
  font-size: 10px; font-weight: 700; font-family: var(--mono);
  letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--text3); margin-bottom: 8px;
}
.formula-item {
  display: flex; align-items: flex-start; gap: 8px;
  padding: 6px 0;
  border-bottom: 1px solid var(--border);
  font-size: 13px; line-height: 1.4;
}
.formula-item:last-child { border-bottom: none; }
.formula-item-dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--accent); flex-shrink: 0; margin-top: 6px;
}
.formula-item-text { color: var(--text); }
.formula-modal-empty {
  color: var(--text3); font-size: 13px; text-align: center;
  padding: 24px 0;
}

/* ============================================================
   AI Tuutor
   ============================================================ */
/* ── Toggle button ─────────────────────────────────────────── */
.ai-tutor-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  font-weight: 500;
  color: var(--text3);
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  padding: 6px 14px;
  cursor: pointer;
  transition: all 0.12s;
  box-shadow: var(--shadow-xs);
  position: relative;
}
.ai-tutor-btn:hover {
  color: var(--accent);
  border-color: var(--accent-border);
  background: var(--accent-subtle);
  box-shadow: 0 1px 4px rgba(37,99,235,0.12);
}
.ai-tutor-btn.open {
  color: var(--accent);
  border-color: var(--accent-border);
  background: var(--accent-subtle);
}
/* Proactive suggestion badge */
.tutor-suggest-badge {
  display: inline-flex;
  align-items: center;
  font-size: 10px;
  font-weight: 600;
  color: #fff;
  background: var(--accent);
  border-radius: 99px;
  padding: 1px 7px;
  margin-left: 2px;
  animation: tutor-pulse 2s ease-in-out infinite;
}
@keyframes tutor-pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.8; transform: scale(0.97); }
}

/* ── Side panel layout ──────────────────────────────────────── */
#q-area.tutor-open {
  display: flex;
  align-items: stretch;
  overflow: hidden;
  padding: 0;
  gap: 0;
}
#q-area.tutor-open .q-area-inner {
  flex: 1;
  min-width: 0;
  max-width: none;
  overflow-y: auto;
  padding: 28px 24px;
}

/* ── Side panel itself ───────────────────────────────────────── */
.ai-tutor-panel {
  display: none;
  flex-direction: column;
  width: 340px;
  flex-shrink: 0;
  border-left: 1px solid var(--border);
  background: var(--card);
  overflow: hidden;
}
.tutor-panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px 9px;
  border-bottom: 1px solid var(--border);
  background: var(--accent-subtle);
  flex-shrink: 0;
}
.tutor-panel-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--accent);
}
.tutor-panel-close {
  font-size: 14px;
  color: var(--text3);
  background: none;
  border: none;
  cursor: pointer;
  padding: 2px 4px;
  border-radius: 4px;
  line-height: 1;
}
.tutor-panel-close:hover { background: var(--surface2); color: var(--text); }

/* ── Quick action chips ─────────────────────────────────────── */
.tutor-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding: 10px 12px 8px;
  border-bottom: 1px solid var(--border);
  background: var(--accent-subtle);
}
.tutor-chip {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 11px;
  font-weight: 500;
  color: var(--accent);
  background: var(--card);
  border: 1px solid var(--accent-border);
  border-radius: 99px;
  padding: 4px 11px;
  cursor: pointer;
  transition: all 0.1s;
  white-space: nowrap;
}
.tutor-chip:hover {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
.tutor-chip-help {
  color: #d97706;
  border-color: rgba(217,119,6,0.3);
  background: #fffbeb;
}
.tutor-chip-help:hover {
  background: #d97706;
  color: #fff;
  border-color: #d97706;
}

/* ── Messages area ──────────────────────────────────────────── */
.tutor-messages {
  flex: 1;
  min-height: 48px;
  overflow-y: auto;
  padding: 10px 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  scroll-behavior: smooth;
}
.tutor-empty {
  color: var(--text3);
  font-size: 12px;
  text-align: center;
  padding: 12px 0 4px;
  font-style: italic;
}

/* ── Message bubbles ─────────────────────────────────────────── */
.tutor-msg {
  display: flex;
  gap: 7px;
  max-width: 100%;
}
.tutor-msg-user {
  flex-direction: row-reverse;
}
.tutor-msg-avatar {
  flex-shrink: 0;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--accent-subtle);
  border: 1px solid var(--accent-border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  margin-top: 2px;
}
.tutor-msg-user .tutor-msg-avatar {
  background: var(--surface2);
  border-color: var(--border2);
}
.tutor-msg-bubble {
  max-width: calc(100% - 32px);
  font-size: 12.5px;
  line-height: 1.65;
  padding: 7px 11px;
  border-radius: var(--radius-lg);
}
.tutor-msg-asst .tutor-msg-bubble {
  background: var(--accent-subtle);
  border: 1px solid var(--accent-border);
  color: var(--text);
  border-radius: 4px var(--radius-lg) var(--radius-lg) var(--radius-lg);
}
.tutor-msg-user .tutor-msg-bubble {
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text2);
  border-radius: var(--radius-lg) 4px var(--radius-lg) var(--radius-lg);
  text-align: right;
}
.tutor-msg-bubble strong { font-weight: 600; color: var(--text); }
/* Math block inside bubble */
.tutor-msg-bubble .math-display {
  display: block;
  text-align: center;
  margin: 6px 0;
  overflow-x: auto;
}

/* Streaming / thinking states */
.tutor-msg-asst:has(.tutor-typing) .tutor-msg-bubble {
  width: 62px;
  min-height: 34px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 8px 12px;
}

.tutor-typing {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 5px;
}

.tutor-typing::before {
  content: "";
  position: absolute;
  inset: -9px -12px;
  border-radius: 999px;
  background: linear-gradient(90deg, transparent, rgba(37,99,235,0.12), transparent);
  transform: translateX(-22px);
  animation: tutorTypingSheen 1.7s ease-in-out infinite;
  pointer-events: none;
}

.tutor-typing span,
.tutor-stream-tail span {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  opacity: 0.42;
  animation: tutorTypingDot 1.15s ease-in-out infinite;
}

.tutor-typing span:nth-child(2),
.tutor-stream-tail span:nth-child(2) {
  animation-delay: 0.14s;
}

.tutor-typing span:nth-child(3),
.tutor-stream-tail span:nth-child(3) {
  animation-delay: 0.28s;
}

.tutor-stream-tail {
  display: inline-flex;
  align-items: center;
  gap: 3px;
  margin-left: 7px;
  vertical-align: 0.08em;
}

.tutor-stream-tail span {
  width: 4px;
  height: 4px;
}

@keyframes tutorTypingDot {
  0%, 70%, 100% {
    opacity: 0.35;
    transform: translateY(0) scale(0.92);
  }
  35% {
    opacity: 1;
    transform: translateY(-4px) scale(1.05);
  }
}

@keyframes tutorTypingSheen {
  0%, 100% {
    opacity: 0;
    transform: translateX(-22px);
  }
  35%, 65% {
    opacity: 1;
  }
  80% {
    opacity: 0;
    transform: translateX(22px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .tutor-typing::before,
  .tutor-typing span,
  .tutor-stream-tail span {
    animation: none;
  }
}

/* ── Input row ──────────────────────────────────────────────── */
.tutor-input-row {
  display: flex;
  gap: 6px;
  padding: 8px 10px 8px;
  border-top: 1px solid var(--border);
  background: var(--card);
  align-items: center;
}
.tutor-input {
  flex: 1;
  font-size: 13px;
  font-family: var(--sans);
  color: var(--text);
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  padding: 6px 10px;
  outline: none;
  transition: border-color 0.1s;
  min-width: 0;
}
.tutor-input:focus {
  border-color: var(--accent-border);
  background: var(--card);
}
.tutor-input::placeholder { color: var(--text3); }
.tutor-input:disabled { opacity: 0.5; cursor: not-allowed; }
.tutor-send-btn {
  flex-shrink: 0;
  width: 30px;
  height: 30px;
  border-radius: var(--radius);
  background: var(--accent);
  border: none;
  color: #fff;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.1s, opacity 0.1s;
}
.tutor-send-btn:hover { background: var(--accent-hover); }
.tutor-send-btn:disabled { opacity: 0.4; cursor: not-allowed; }

/* ── Free tier notice ────────────────────────────────────────── */
.tutor-free-notice {
  padding: 5px 12px 8px;
  font-size: 11px;
  color: var(--text3);
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--card);
}
.tutor-upgrade-link {
  font-size: 11px;
  font-weight: 600;
  color: var(--accent);
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
  text-decoration: underline;
  text-underline-offset: 2px;
}
.tutor-upgrade-link:hover { color: var(--accent-hover); }

/* Error message */
.tutor-msg-error .tutor-msg-bubble {
  background: var(--red-light);
  border-color: rgba(239,68,68,0.25);
  color: var(--red);
}

.tutor-msg-warning .tutor-msg-bubble {
  border-color: rgba(245,158,11,0.30);
  box-shadow: inset 0 -3px 0 rgba(245,158,11,0.12);
}

/* Mobile: side panel goes below question instead of beside it */
@media (max-width: 900px) {
  #q-area.tutor-open {
    flex-direction: column;
    overflow-y: auto;
  }
  #q-area.tutor-open .q-area-inner {
    overflow-y: visible;
    padding: 16px 14px 0;
  }
  .ai-tutor-panel {
    width: 100%;
    border-left: none;
    border-top: 1px solid var(--border);
    height: 480px;
  }
}

/* ── Õppimiskalender ────────────────────────────────────────── */
.cal-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 18px;
  padding: 18px 20px 16px;
  border-bottom: 1px solid var(--border);
}
.cal-controls {
  display: grid;
  grid-template-columns: minmax(230px, 0.85fr) minmax(280px, 1.15fr);
  gap: 12px;
  align-items: stretch;
  flex: 1;
  min-width: 320px;
  max-width: 760px;
}
.cal-date-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}
.cal-date-field,
.cal-intensity-wrap {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 9px 10px;
}
.cal-date-field {
  display: flex;
  flex-direction: column;
  gap: 5px;
}
.cal-date-field span,
.cal-intensity-top span {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text3);
}
.cal-date-field input {
  width: 100%;
  min-width: 0;
  border: 0;
  outline: 0;
  background: transparent;
  color: var(--text);
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 700;
}
.cal-intensity-wrap {
  display: flex;
  flex-direction: column;
  gap: 7px;
}
.cal-intensity-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.cal-intensity-top strong {
  color: var(--accent);
  font-size: 12px;
}
.cal-intensity-slider {
  width: 100%;
  height: 4px;
  margin: 2px 0 0;
  accent-color: var(--accent);
  cursor: pointer;
}
.cal-intensity-scale {
  position: relative;
  height: 16px;
  color: var(--text3);
  font-size: 9px;
  line-height: 1.2;
}
.cal-intensity-scale span {
  position: absolute;
  top: 2px;
  white-space: nowrap;
}
.cal-intensity-scale span:nth-child(1) { left: 0; }
.cal-intensity-scale span:nth-child(2) { left: 33.333%; transform: translateX(-50%); }
.cal-intensity-scale span:nth-child(3) { left: 66.667%; transform: translateX(-50%); }
.cal-intensity-scale span:nth-child(4) {
  right: 0;
  color: var(--accent);
  font-weight: 700;
}
.cal-intensity-detail {
  color: var(--text2);
  font-size: 11px;
  line-height: 1.35;
}
.cal-summary-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  padding: 14px 0 0;
  border-top: 1px solid var(--border);
  margin-top: 4px;
}
.cal-summary-row div {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--text3);
}
.cal-summary-row span {
  color: var(--text);
  font-weight: 700;
}
.cal-month-block { margin-bottom: 28px; }
.cal-month-name {
  font-size: 13px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 10px;
  letter-spacing: -0.01em;
}
.cal-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 3px;
}
.cal-dow {
  font-family: var(--mono);
  font-size: 9px;
  text-align: center;
  color: var(--text3);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 4px 0 6px;
  font-weight: 600;
}
.cal-cell {
  min-height: 64px;
  border-radius: 7px;
  padding: 5px 5px 5px;
  background: var(--bg);
  border: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 3px;
  overflow: hidden;
  transition: border-color 0.12s, box-shadow 0.12s;
  cursor: default;
}
.cal-cell-empty { background: transparent; border: none; min-height: 64px; }
.cal-cell-num {
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 600;
  color: var(--text3);
  line-height: 1;
}
.cal-today { border-color: var(--accent) !important; box-shadow: 0 0 0 1px var(--accent) inset; }
.cal-today .cal-cell-num { color: var(--accent); }
.cal-past { opacity: 0.38; }
.cal-outside-range { opacity: 0.3; background: transparent; }
.cal-range-start,
.cal-range-end { position: relative; }
.cal-range-start::after,
.cal-range-end::after {
  content: '';
  position: absolute;
  top: 5px;
  right: 5px;
  width: 5px;
  height: 5px;
  border-radius: 999px;
  background: var(--accent);
}
.cal-study-day { background: var(--surface); }
.cal-rest-day { background: var(--surface2); border-style: dashed; }
.cal-exam-day {
  background: var(--accent-subtle);
  border-color: var(--accent) !important;
  box-shadow: 0 0 0 1px var(--accent) inset;
}
.cal-exam-day .cal-cell-num { color: var(--accent); font-weight: 700; }
.cal-cell-label { font-size: 8.5px; font-weight: 700; letter-spacing: 0.05em; text-transform: uppercase; }
.cal-exam-label { color: var(--accent); }
.cal-rest-label { color: var(--text3); }
.cal-chips { display: flex; flex-direction: column; gap: 2px; margin-top: 2px; }
.cal-chip {
  display: block;
  font-size: 8.5px;
  font-weight: 600;
  padding: 2px 4px;
  border-radius: 3px;
  line-height: 1.3;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.cal-chip-weak   { background: var(--red-light);   color: var(--red); }
.cal-chip-medium { background: var(--gold-light);  color: var(--gold); }
.cal-chip-ok     { background: var(--gold-light);  color: var(--gold); }
.cal-chip-strong { background: var(--green-light); color: var(--green); }
.cal-chip-unseen { background: var(--accent-light); color: var(--accent); }

.cal-progress-badge {
  font-size: 9px;
  font-weight: 700;
  color: var(--green);
  background: rgba(74,222,128,0.13);
  border-radius: 3px;
  padding: 1px 5px;
  margin-top: 3px;
  text-align: center;
  line-height: 1.5;
}
.cal-progress-zero {
  color: var(--text3);
  background: transparent;
  font-weight: 500;
}

/* ── AI Ülevaade ────────────────────────────────────────────── */
.ai-ov-loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 32px 20px;
}
.ai-ov-dot-pulse {
  display: flex;
  gap: 6px;
  align-items: center;
}
.ai-ov-dot-pulse span {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--accent);
  animation: aiDotPulse 1.3s ease-in-out infinite;
}
.ai-ov-dot-pulse span:nth-child(2) { animation-delay: 0.22s; }
.ai-ov-dot-pulse span:nth-child(3) { animation-delay: 0.44s; }
@keyframes aiDotPulse {
  0%, 80%, 100% { opacity: 0.2; transform: scale(0.75); }
  40% { opacity: 1; transform: scale(1); }
}
.ai-ov-content { font-size: 13px; line-height: 1.7; color: var(--text2); }
.ai-ov-heading {
  font-size: 11px;
  font-weight: 700;
  color: var(--text);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin: 20px 0 8px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 6px;
}
.ai-ov-heading:first-child { margin-top: 0; }
.ai-ov-para {
  font-size: 13px;
  color: var(--text2);
  line-height: 1.7;
  margin: 6px 0;
}
.ai-ov-list {
  margin: 8px 0 12px 0;
  padding-left: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.ai-ov-li {
  font-size: 12.5px;
  color: var(--text2);
  line-height: 1.6;
  padding: 6px 8px 6px 20px;
  position: relative;
  border-radius: 5px;
  background: var(--surface);
}
.ai-ov-li::before {
  content: '→';
  position: absolute;
  left: 6px;
  color: var(--accent);
  font-size: 11px;
  font-weight: 700;
}
.ai-ov-li strong { color: var(--text); }

/* ============================================================
   2026 UI remake — clean white product shell
   ============================================================ */
:root {
  --bg: #f7f7f4;
  --surface: #f0efea;
  --surface2: #e9e7e1;
  --card: #ffffff;
  --border: #e5e2da;
  --border2: #d8d4ca;
  --text: #171825;
  --text2: #5d6070;
  --text3: #9295a1;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --accent-light: #dbeafe;
  --accent-subtle: #eff6ff;
  --accent-border: rgba(37,99,235,0.24);
  --sb-bg: rgba(255,255,255,0.88);
  --sb-text: #5f6372;
  --sb-text-dim: #a1a4ae;
  --sb-border: rgba(23,24,37,0.08);
  --sb-hover: rgba(37,99,235,0.06);
  --sb-active-bg: #eff6ff;
  --sb-active: #2563eb;
  --sb-text-hover: #171825;
  --radius: 8px;
  --radius-lg: 8px;
  --shadow-xs: 0 1px 2px rgba(23,24,37,0.04);
  --shadow-sm: 0 1px 2px rgba(23,24,37,0.05), 0 8px 24px rgba(23,24,37,0.04);
  --shadow-md: 0 1px 2px rgba(23,24,37,0.05), 0 18px 42px rgba(23,24,37,0.08);
  --shadow-lg: 0 24px 70px rgba(23,24,37,0.12), 0 6px 18px rgba(23,24,37,0.06);
}

html[data-theme="dark"] {
  --bg: #111018;
  --surface: #1a1727;
  --surface2: #211f30;
  --card: #181525;
  --border: rgba(255,255,255,0.08);
  --border2: rgba(255,255,255,0.14);
  --text: #e6e3f0;
  --text2: #9a95ad;
  --text3: #5f5a72;
  --text-primary: #e6e3f0;
  --text-secondary: #9a95ad;
  --text-tertiary: #5f5a72;
  --divider: rgba(255,255,255,0.08);
  --surface-hover: #211f30;
  --accent-light: rgba(37,99,235,0.18);
  --accent-subtle: rgba(37,99,235,0.10);
  --accent-border: rgba(37,99,235,0.35);
  --green-light: rgba(34,197,94,0.14);
  --red-light: rgba(239,68,68,0.14);
  --gold-light: rgba(245,158,11,0.14);
  --sb-bg: rgba(19,17,26,0.92);
  --sb-text: #9a95ad;
  --sb-text-dim: rgba(154,149,173,0.46);
  --sb-border: rgba(255,255,255,0.07);
  --sb-hover: rgba(255,255,255,0.05);
  --sb-active-bg: #1a2845;
  --sb-active: #93c5fd;
  --sb-text-hover: #e6e3f0;
  --shadow-xs: 0 1px 2px rgba(0,0,0,0.36);
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.44), 0 8px 24px rgba(0,0,0,0.22);
  --shadow-md: 0 2px 8px rgba(0,0,0,0.48), 0 18px 42px rgba(0,0,0,0.28);
  --shadow-lg: 0 24px 70px rgba(0,0,0,0.55), 0 6px 18px rgba(0,0,0,0.34);
}

body {
  background: linear-gradient(180deg, #ffffff 0%, #f7f7f4 42%, #f4f3ee 100%);
  letter-spacing: 0;
}

#sidebar {
  background: var(--sb-bg);
  border-right: 1px solid var(--sb-border);
  box-shadow: 18px 0 46px rgba(23,24,37,0.05);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
}

html[data-sidebar-pos="right"] #sidebar {
  border-right: none;
  border-left: 1px solid var(--sb-border);
  box-shadow: -18px 0 46px rgba(23,24,37,0.05);
}

#main { background: transparent; }

.sb-logo { padding: 22px 18px 16px; border-bottom: 1px solid var(--sb-border); }
.sb-logo-name { color: var(--text); font-size: 17px; font-weight: 800; letter-spacing: 0; }
.course-toggle, .sb-search-inner { background: #f7f7f4 !important; border-color: var(--border) !important; border-radius: 8px !important; }
.sb-search-wrap { padding: 12px 12px 6px; }
.sb-search-inner { padding: 8px 10px; }
.sb-search-inner:focus-within { background: #fff !important; border-color: var(--accent-border) !important; box-shadow: 0 0 0 4px rgba(37,99,235,0.08); }
.sb-nav { padding: 10px 10px 0; }
.sb-nav-item { border-radius: 8px; min-height: 36px; padding: 9px 11px; font-size: 13px; font-weight: 500; }
.sb-nav-item.active { box-shadow: inset 0 0 0 1px var(--accent-border); }
.sb-divider { margin: 10px 12px; }
.sb-footer { background: rgba(255,255,255,0.72); border-top: 1px solid var(--sb-border); padding: 10px; }
.sb-footer-btn, .sb-footer-icon-btn, .btn { border-radius: 8px; }
.btn { font-weight: 600; min-height: 32px; }
.btn-primary { box-shadow: 0 4px 16px rgba(37,99,235,0.20), 0 1px 2px rgba(37,99,235,0.16); }
.btn-outline { background: #fff; }

.exam-header,
.part-tabs,
.q-nav,
.submit-row,
.tv-header,
.exams-header,
.th-header,
.study-header,
#mobile-topbar {
  background: rgba(255,255,255,0.9);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}

.exam-header,
.tv-header,
.exams-header,
.th-header { padding-left: 28px; padding-right: 28px; }

.eh-title,
.tv-title,
.exams-title,
.th-title,
.analysis-header-title,
.study-title {
  font-weight: 750;
  letter-spacing: 0;
}

.subpart,
.tv-topic-card,
.exam-card,
.th-section,
.th-topic-card,
.analysis-section,
.res-stat,
.res-table,
.rm-modal-box,
.settings-panel,
.val-card,
.fc-card,
.fc-ctx-panel,
#analysis-content > div,
.study-hero-card,
#ai-calendar-section {
  background: #fff !important;
  border-color: var(--border) !important;
  border-radius: 8px !important;
  box-shadow: var(--shadow-sm);
}

.tv-topic-card,
.exam-card,
.th-topic-card { padding: 18px; }
.tv-topic-card:hover,
.exam-card:hover,
.th-topic-card:hover { box-shadow: var(--shadow-md); }
.ans-num, .ans-text, .choice, .tv-search, .search-input { background: #fff; border-radius: 8px; }
.q-dot:not(.active):not(.correct):not(.wrong):not(.partial) { background: #fff; border-radius: 8px; }

#analysis-inner {
  max-width: 1100px;
  width: 100%;
  margin: 0 auto;
}

#study-view {
  display: none;
  flex-direction: column;
  flex: 1;
  min-height: 0;
  overflow-y: auto;
}

.study-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 22px 28px 18px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.study-title { font-size: 22px; color: var(--text); }
.study-eyebrow,
.study-kicker {
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
}

#study-content { padding: 28px; }
.study-shell { max-width: 1180px; margin: 0 auto; display: grid; gap: 14px; }
.study-hero-card { display: flex; align-items: center; justify-content: space-between; gap: 18px; padding: 24px; }
.study-hero-card h2 {
  margin: 4px 0 8px;
  color: var(--text);
  font-size: clamp(26px, 4vw, 44px);
  line-height: 1;
  letter-spacing: 0;
}
.study-hero-card p { color: var(--text2); line-height: 1.6; max-width: 580px; }
#ai-calendar-section { margin-top: 0 !important; }
.cal-study-day { background: #fbfbfa; }
.cal-rest-day { background: #f8fafc; }
#valemid-view .tv-header, #val-tree { background: rgba(255,255,255,0.9) !important; }
#val-search { background: #fff !important; }

html[data-theme="dark"] body {
  background: linear-gradient(180deg, #111018 0%, #151321 52%, #0f0e17 100%);
}

html[data-theme="dark"] .course-toggle,
html[data-theme="dark"] .sb-search-inner,
html[data-theme="dark"] .ans-num,
html[data-theme="dark"] .ans-text,
html[data-theme="dark"] .choice,
html[data-theme="dark"] .tv-search,
html[data-theme="dark"] .search-input,
html[data-theme="dark"] .q-dot,
html[data-theme="dark"] #val-search {
  background: var(--surface) !important;
  border-color: var(--border) !important;
  color: var(--text) !important;
}

html[data-theme="dark"] .exam-header,
html[data-theme="dark"] .part-tabs,
html[data-theme="dark"] .q-nav,
html[data-theme="dark"] .submit-row,
html[data-theme="dark"] .tv-header,
html[data-theme="dark"] .exams-header,
html[data-theme="dark"] .th-header,
html[data-theme="dark"] .study-header,
html[data-theme="dark"] .sb-footer,
html[data-theme="dark"] #mobile-topbar {
  background: rgba(24,21,37,0.92);
}

html[data-theme="dark"] .sb-footer-btn,
html[data-theme="dark"] .sb-footer-icon-btn {
  background: rgba(255,255,255,0.04);
  border-color: var(--sb-border);
  color: var(--sb-text);
}

html[data-theme="dark"] .sb-footer-btn:hover,
html[data-theme="dark"] .sb-footer-icon-btn:hover {
  background: rgba(255,255,255,0.08);
  color: var(--sb-text-hover);
}

html[data-theme="dark"] .sb-footer-btn.danger {
  color: #f87171;
}

html[data-theme="dark"] .sb-footer-btn.danger:hover {
  background: rgba(248,113,113,0.12);
  color: #fca5a5;
}

html[data-theme="dark"] #mobile-topbar,
html[data-theme="dark"] #mobile-bottom-nav,
html[data-theme="dark"] #mobile-more-sheet {
  background: rgba(24,21,37,0.92);
  border-color: var(--border);
}

html[data-theme="dark"] #mobile-bottom-nav {
  box-shadow: 0 18px 50px rgba(0,0,0,0.38);
}

html[data-theme="dark"] .mobile-topbar-btn,
html[data-theme="dark"] .mobile-sheet-close,
html[data-theme="dark"] .mobile-course-toggle,
html[data-theme="dark"] .mobile-sheet-grid button,
html[data-theme="dark"] .mobile-sheet-actions button {
  background: rgba(255,255,255,0.045);
  border-color: var(--border);
  color: var(--text);
}

html[data-theme="dark"] .mobile-course-toggle button.active {
  background: var(--accent);
  color: #fff;
}

html[data-theme="dark"] .mobile-sheet-actions button.danger {
  color: #f87171;
  background: rgba(248,113,113,0.12);
}

html[data-theme="dark"] .btn-outline,
html[data-theme="dark"] .subpart,
html[data-theme="dark"] .tv-topic-card,
html[data-theme="dark"] .exam-card,
html[data-theme="dark"] .th-section,
html[data-theme="dark"] .th-topic-card,
html[data-theme="dark"] .analysis-section,
html[data-theme="dark"] .res-stat,
html[data-theme="dark"] .res-table,
html[data-theme="dark"] .rm-modal-box,
html[data-theme="dark"] .settings-panel,
html[data-theme="dark"] .val-card,
html[data-theme="dark"] .fc-card,
html[data-theme="dark"] .fc-ctx-panel,
html[data-theme="dark"] #analysis-content > div,
html[data-theme="dark"] .study-hero-card,
html[data-theme="dark"] #ai-calendar-section {
  background: var(--card) !important;
  border-color: var(--border) !important;
  color: var(--text);
}

html[data-theme="dark"] .cal-study-day {
  background: var(--surface);
}

html[data-theme="dark"] .cal-rest-day {
  background: var(--surface2);
}

html[data-theme="dark"] .cal-date-field,
html[data-theme="dark"] .cal-intensity-wrap,
html[data-theme="dark"] .cal-cell {
  background: rgba(255,255,255,0.035);
  border-color: var(--border);
}

html[data-theme="dark"] .cal-outside-range {
  background: transparent;
}

html[data-theme="dark"] #valemid-view .tv-header,
html[data-theme="dark"] #val-tree {
  background: rgba(19,17,26,0.92) !important;
}

@media (max-width: 900px) {
  .study-hero-card,
  .study-header { align-items: stretch; flex-direction: column; }
  .cal-controls {
    grid-template-columns: 1fr;
    min-width: 100%;
    max-width: none;
  }
}

@media (max-width: 640px) {
  .exam-header,
  .tv-header,
  .exams-header,
  .th-header,
  .study-header { padding-left: 16px; padding-right: 16px; }
  #study-content { padding: 16px 16px calc(160px + env(safe-area-inset-bottom, 0px)); }
  .cal-header { padding: 16px; }
  .cal-date-row { grid-template-columns: 1fr; }
  .cal-cell { min-height: 58px; padding: 4px; }
  .cal-intensity-scale { font-size: 8.5px; }
}

/* Final status-dot override: keep task state visible in every theme. */
.q-nav .q-dot.correct,
html[data-theme="dark"] .q-nav .q-dot.correct {
  background: #16a34a !important;
  background-color: #16a34a !important;
  background-image: none !important;
  border-color: #4ade80 !important;
  color: #ffffff !important;
  box-shadow: 0 0 0 1px rgba(74,222,128,0.55), 0 4px 14px rgba(34,197,94,0.42) !important;
}

.q-nav .q-dot.wrong,
html[data-theme="dark"] .q-nav .q-dot.wrong {
  background: #dc2626 !important;
  background-color: #dc2626 !important;
  background-image: none !important;
  border-color: #f87171 !important;
  color: #ffffff !important;
  box-shadow: 0 0 0 1px rgba(248,113,113,0.62), 0 4px 16px rgba(239,68,68,0.48) !important;
}

.q-nav .q-dot.partial,
html[data-theme="dark"] .q-nav .q-dot.partial {
  background: #f59e0b !important;
  background-color: #f59e0b !important;
  background-image: none !important;
  border-color: #fbbf24 !important;
  color: #111018 !important;
  box-shadow: 0 0 0 1px rgba(251,191,36,0.60), 0 4px 16px rgba(245,158,11,0.46) !important;
}

.q-nav .q-dot.correct.active,
html[data-theme="dark"] .q-nav .q-dot.correct.active {
  box-shadow: 0 0 0 3px rgba(74,222,128,0.38), 0 5px 18px rgba(34,197,94,0.46) !important;
}

.q-nav .q-dot.wrong.active,
html[data-theme="dark"] .q-nav .q-dot.wrong.active {
  box-shadow: 0 0 0 3px rgba(248,113,113,0.40), 0 5px 18px rgba(239,68,68,0.52) !important;
}

.q-nav .q-dot.partial.active,
html[data-theme="dark"] .q-nav .q-dot.partial.active {
  box-shadow: 0 0 0 3px rgba(251,191,36,0.42), 0 5px 18px rgba(245,158,11,0.50) !important;
}

/* ===== DEMO VIDEO SECTION ===== */
.demo-section {
  padding: 80px 0 100px;
  overflow: hidden;
}

.demo-stage {
  position: relative;
  margin-top: 48px;
}

.demo-stage::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 80%;
  height: 100%;
  background: radial-gradient(ellipse at center, rgba(37,99,235,0.13) 0%, transparent 68%);
  filter: blur(56px);
  pointer-events: none;
  z-index: 0;
}

html[data-theme="dark"] .demo-stage::before {
  background: radial-gradient(ellipse at center, rgba(37,99,235,0.22) 0%, transparent 68%);
}

.demo-browser {
  position: relative;
  z-index: 1;
  width: min(760px, 100%);
  margin: 0 auto;
  background: var(--card);
  border-radius: 14px;
  overflow: hidden;
  border: 1px solid var(--border);
  box-shadow:
    0 1px 2px rgba(0,0,0,0.04),
    0 4px 16px rgba(0,0,0,0.07),
    0 24px 64px rgba(0,0,0,0.11);
}

html[data-theme="dark"] .demo-browser {
  box-shadow:
    0 1px 0 rgba(255,255,255,0.05) inset,
    0 4px 16px rgba(0,0,0,0.4),
    0 28px 72px rgba(0,0,0,0.55);
}

.demo-chrome {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 11px 16px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  user-select: none;
}

.chrome-dots {
  display: flex;
  gap: 6px;
  flex-shrink: 0;
}

.chrome-dots span {
  display: block;
  width: 12px;
  height: 12px;
  border-radius: 50%;
}
.chrome-dots span:nth-child(1) { background: #fc5f57; }
.chrome-dots span:nth-child(2) { background: #fdbc2c; }
.chrome-dots span:nth-child(3) { background: #34c749; }

html[data-theme="dark"] .chrome-dots span:nth-child(1) { background: #ff6059; }
html[data-theme="dark"] .chrome-dots span:nth-child(2) { background: #ffbd2e; }
html[data-theme="dark"] .chrome-dots span:nth-child(3) { background: #28c840; }

.chrome-bar {
  flex: 1;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 4px 14px;
  font-size: 12px;
  color: var(--text3);
  text-align: center;
  max-width: 220px;
  margin: 0 auto;
  letter-spacing: 0.01em;
}

.demo-video-wrap {
  position: relative;
  background: #0a0a0f;
  display: block;
  cursor: pointer;
  line-height: 0;
  overflow: hidden;
}

.demo-video {
  width: 100%;
  max-width: 100%;
  height: auto;
  display: block;
}

.demo-play-btn {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  background: transparent;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.22s, background 0.22s;
}

.demo-video-wrap:hover .demo-play-btn,
.demo-video-wrap.is-paused .demo-play-btn {
  opacity: 1;
}

.demo-video-wrap:hover .demo-play-btn {
  background: rgba(0,0,0,0.14);
}

.demo-video-wrap.is-paused .demo-play-btn {
  background: rgba(0,0,0,0.22);
}

.demo-play-icon {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background: rgba(255,255,255,0.16);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1.5px solid rgba(255,255,255,0.32);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.15s, background 0.15s;
}

.demo-play-btn:hover .demo-play-icon {
  transform: scale(1.07);
  background: rgba(255,255,255,0.24);
}

.demo-play-btn svg {
  width: 20px;
  height: 20px;
  color: #fff;
  fill: #fff;
  stroke: none;
}

.demo-play-btn .icon-pause { display: none; }
.demo-play-btn.is-playing .icon-play { display: none; }
.demo-play-btn.is-playing .icon-pause { display: block; }

.demo-mute-badge {
  position: absolute;
  bottom: 14px;
  right: 14px;
  background: rgba(0,0,0,0.48);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 6px;
  padding: 4px 9px;
  font-size: 11px;
  color: rgba(255,255,255,0.6);
  letter-spacing: 0.03em;
  pointer-events: none;
  display: flex;
  align-items: center;
  gap: 5px;
  font-weight: 500;
}

.demo-mute-badge svg {
  width: 12px;
  height: 12px;
  stroke: rgba(255,255,255,0.6);
  fill: none;
  stroke-width: 2;
  flex-shrink: 0;
}

/* ============================================================
   OPPEPLAAN WIZARD
   ============================================================ */

.wiz-shell { max-width: 680px; margin: 0 auto; padding: 0 4px; }

.wiz-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 32px 36px 28px;
  box-shadow: var(--shadow);
}

.wiz-progress { display: flex; align-items: center; justify-content: center; margin-bottom: 6px; }

.wiz-dot {
  width: 28px; height: 28px; border-radius: 50%;
  border: 2px solid var(--border2); background: var(--surface);
  color: var(--text3); font-size: 11px; font-weight: 700;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0; transition: all 0.2s;
}
.wiz-dot-active { border-color: var(--accent); background: var(--accent); color: #fff; box-shadow: 0 0 0 4px var(--accent-light); }
.wiz-dot-done   { border-color: var(--green);  background: var(--green);  color: #fff; }
.wiz-line       { flex: 1; height: 2px; background: var(--border2); max-width: 60px; transition: background 0.3s; }
.wiz-line-done  { background: var(--green); }
.wiz-step-label { text-align: center; font-size: 11px; color: var(--text3); margin-bottom: 24px; }

.wiz-step-body  { margin-bottom: 28px; }
.wiz-step-icon  { font-size: 36px; margin-bottom: 10px; }
.wiz-step-title { font-size: 22px; font-weight: 800; color: var(--text); margin-bottom: 8px; }
.wiz-step-sub   { font-size: 14px; color: var(--text2); line-height: 1.5; margin-bottom: 24px; }

.wiz-field-group { margin-bottom: 20px; }
.wiz-label { display: block; font-size: 13px; font-weight: 600; color: var(--text); margin-bottom: 8px; }
.wiz-date-input {
  width: 100%; padding: 10px 12px; border: 1px solid var(--border);
  border-radius: 8px; background: var(--surface); color: var(--text);
  font-size: 15px; font-family: var(--font); box-sizing: border-box;
}

.wiz-q-options { display: flex; gap: 8px; flex-wrap: wrap; }
.wiz-q-opt {
  display: flex; flex-direction: column; align-items: center; gap: 3px;
  padding: 12px 16px; border: 2px solid var(--border); border-radius: 12px;
  background: var(--surface); cursor: pointer; transition: all 0.15s; min-width: 78px; user-select: none;
}
.wiz-q-opt:hover { border-color: var(--accent); background: var(--accent-subtle); }
.wiz-q-opt-sel   { border-color: var(--accent) !important; background: var(--accent-light) !important; }
.wiz-q-num  { font-size: 22px; font-weight: 800; color: var(--text); font-family: var(--mono); }
.wiz-q-lbl  { font-size: 11px; font-weight: 600; color: var(--text2); }
.wiz-q-time { font-size: 10px; color: var(--text3); }

.wiz-days-grid { display: grid; grid-template-columns: repeat(7, 1fr); gap: 8px; }
.wiz-day-opt {
  display: flex; flex-direction: column; align-items: center; gap: 4px;
  padding: 12px 4px; border: 2px solid var(--border); border-radius: 10px;
  background: var(--surface); cursor: pointer; transition: all 0.15s; user-select: none;
}
.wiz-day-opt:hover { border-color: var(--accent); background: var(--accent-subtle); }
.wiz-day-opt-sel   { border-color: var(--accent) !important; background: var(--accent-light) !important; }
.wiz-day-letter { font-size: 16px; font-weight: 800; color: var(--text); }
.wiz-day-full   { font-size: 9px; color: var(--text3); text-align: center; }

.wiz-topics-grid { display: flex; flex-wrap: wrap; gap: 8px; max-height: 300px; overflow-y: auto; padding: 2px; }
.wiz-topic-chip {
  display: flex; align-items: center; gap: 6px; padding: 7px 12px;
  border: 2px solid var(--border); border-radius: 20px;
  background: var(--surface); cursor: pointer; font-size: 13px; color: var(--text);
  font-family: var(--font); transition: all 0.15s;
}
.wiz-topic-chip:hover  { border-color: var(--accent); background: var(--accent-subtle); }
.wiz-topic-chip-sel    { border-color: var(--accent) !important; background: var(--accent-light) !important; color: var(--accent) !important; font-weight: 600; }
.wiz-tc-badge   { font-size: 10px; font-weight: 700; padding: 2px 5px; border-radius: 4px; }
.wiz-tc-weak    { background: #fee2e2; color: #dc2626; }
.wiz-tc-ok      { background: #fef3c7; color: #d97706; }
.wiz-tc-strong  { background: #dcfce7; color: #16a34a; }
.wiz-tc-unseen  { background: var(--surface2); color: var(--text3); }

.wiz-goals { display: flex; flex-direction: column; gap: 10px; }
.wiz-goal-opt {
  display: flex; align-items: center; gap: 14px; padding: 16px 18px;
  border: 2px solid var(--border); border-radius: 12px;
  background: var(--surface); cursor: pointer; transition: all 0.15s; user-select: none;
}
.wiz-goal-opt:hover { border-color: var(--accent); background: var(--accent-subtle); }
.wiz-goal-opt-sel   { border-color: var(--accent) !important; background: var(--accent-light) !important; }
.wiz-goal-icon  { font-size: 28px; flex-shrink: 0; }
.wiz-goal-title { font-size: 15px; font-weight: 700; color: var(--text); margin-bottom: 2px; }
.wiz-goal-desc  { font-size: 12px; color: var(--text2); }

.wiz-actions {
  display: flex; align-items: center; justify-content: space-between;
  gap: 12px; padding-top: 20px; border-top: 1px solid var(--border);
}

.wiz-loading-card  { text-align: center; padding: 48px 24px; }
.wiz-loading-icon  { font-size: 48px; margin-bottom: 16px; animation: wiz-bounce 1s ease-in-out infinite; }
.wiz-loading-title { font-size: 18px; font-weight: 700; color: var(--text); margin-bottom: 8px; }
.wiz-loading-sub   { font-size: 14px; color: var(--text2); margin-bottom: 24px; }
.wiz-loader {
  width: 40px; height: 40px; margin: 0 auto;
  border: 3px solid var(--border); border-top-color: var(--accent);
  border-radius: 50%; animation: wiz-spin 0.8s linear infinite;
}
@keyframes wiz-bounce { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-8px); } }
@keyframes wiz-spin   { to { transform: rotate(360deg); } }

.wiz-settings-bar {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 12px 16px; background: var(--surface); border: 1px solid var(--border);
  border-radius: 12px; flex-wrap: wrap; margin-bottom: 14px;
}
.wiz-settings-items { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.wiz-setting-item {
  display: flex; align-items: center; gap: 5px; font-size: 12px; color: var(--text2);
  background: var(--card); border: 1px solid var(--border); border-radius: 20px; padding: 4px 10px;
}
.wiz-setting-icon { font-size: 13px; }
.wiz-edit-btn {
  font-size: 12px; padding: 6px 12px; border: 1px solid var(--border);
  border-radius: 7px; background: var(--surface2); color: var(--text2);
  cursor: pointer; white-space: nowrap; flex-shrink: 0;
}
.wiz-edit-btn:hover { background: var(--border2); color: var(--text); }

.wiz-plan-card { background: var(--card); border: 1px solid var(--border); border-radius: 14px; overflow: hidden; margin-bottom: 14px; }
.wiz-plan-header {
  display: flex; align-items: center; gap: 12px; padding: 14px 18px;
  background: linear-gradient(135deg, #4f46e5 0%, #7c3aed 100%); color: white;
}
.wiz-plan-icon  { font-size: 22px; flex-shrink: 0; }
.wiz-plan-title { font-size: 14px; font-weight: 700; }
.wiz-plan-sub   { font-size: 11px; opacity: 0.8; margin-top: 1px; }
.wiz-plan-regen {
  margin-left: auto; background: rgba(255,255,255,0.15); border: 1px solid rgba(255,255,255,0.3);
  border-radius: 6px; color: white; font-size: 11px; padding: 5px 10px; cursor: pointer; flex-shrink: 0;
}
.wiz-plan-regen:hover { background: rgba(255,255,255,0.25); }
.wiz-plan-body { padding: 18px 20px; font-size: 13.5px; color: var(--text); line-height: 1.65; }
.wiz-plan-body strong { font-weight: 700; color: var(--text); }
.wiz-plan-body p { margin: 0 0 10px; }
.wiz-plan-body p:last-child { margin-bottom: 0; }
.wiz-plan-section { font-size: 11px; font-weight: 700; color: var(--accent); text-transform: uppercase; letter-spacing: 0.05em; margin: 12px 0 2px; }

/* ============================================================
   Paywall teaser previews
   ============================================================ */
.tease-shell {
  position: relative;
  min-height: min(560px, calc(100vh - 220px));
  display: grid;
  place-items: center;
  overflow: hidden;
  border-radius: 14px;
  background: linear-gradient(180deg, var(--surface), var(--bg));
  border: 1px solid var(--border);
  padding: 28px;
}

.tv-body > .tease-shell {
  grid-column: 1 / -1;
}

.tease-preview {
  position: absolute;
  inset: 18px;
  overflow: hidden;
  opacity: 0.78;
  filter: blur(3.5px);
  transform: scale(1.012);
  pointer-events: none;
  user-select: none;
}

.tease-preview::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(255,255,255,0.22), rgba(255,255,255,0.72)),
    radial-gradient(circle at 50% 15%, rgba(37,99,235,0.16), transparent 42%);
}

html[data-theme="dark"] .tease-preview::after {
  background:
    linear-gradient(180deg, rgba(17,16,24,0.26), rgba(17,16,24,0.84)),
    radial-gradient(circle at 50% 15%, rgba(147,197,253,0.14), transparent 44%);
}

.tease-card {
  position: relative;
  z-index: 2;
  width: min(520px, 100%);
  background: color-mix(in srgb, var(--card) 92%, transparent);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 26px 28px;
  box-shadow: var(--shadow-lg);
  text-align: left;
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
}

.tease-kicker {
  font-family: var(--mono);
  font-size: 10px;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-weight: 700;
  margin-bottom: 10px;
}

.tease-card h2 {
  margin: 0 0 10px;
  font-size: 24px;
  line-height: 1.14;
  color: var(--text);
  letter-spacing: 0;
}

.tease-card p {
  margin: 0;
  color: var(--text2);
  font-size: 14px;
  line-height: 1.6;
}

.tease-bullets {
  display: grid;
  gap: 8px;
  margin-top: 18px;
}

.tease-bullets div {
  display: flex;
  align-items: flex-start;
  gap: 9px;
  color: var(--text);
  font-size: 13px;
  line-height: 1.45;
}

.tease-bullets span {
  width: 7px;
  height: 7px;
  margin-top: 6px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 4px var(--accent-subtle);
  flex-shrink: 0;
}

.tease-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 22px;
}

.tease-primary,
.tease-secondary {
  min-height: 38px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  padding: 0 15px;
  font-size: 13px;
  font-weight: 700;
  text-decoration: none;
  cursor: pointer;
}

.tease-primary {
  background: var(--accent);
  color: #fff;
  border: 1px solid var(--accent);
}

.tease-primary:hover { background: var(--accent-hover); }

.tease-secondary {
  background: transparent;
  color: var(--text2);
  border: 1px solid var(--border);
  font-family: var(--sans);
}

.tease-secondary:hover {
  color: var(--text);
  background: var(--surface);
}

.tease-dashboard,
.tease-calendar,
.tease-formula-layout,
.tease-topic-grid {
  width: 100%;
  min-height: 430px;
}

.tease-dashboard {
  display: grid;
  grid-template-columns: 160px 1fr;
  gap: 14px;
  align-content: start;
}

.tease-gauge,
.tease-panel,
.tease-topic-card,
.tease-plan-card,
.tease-formula-tree,
.tease-formula-list > div,
.tease-exam-paper,
.tease-fc-card,
.tease-theory {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: var(--shadow-sm);
}

.tease-gauge {
  aspect-ratio: 1;
  display: grid;
  place-items: center;
  text-align: center;
}

.tease-gauge strong {
  display: block;
  font-family: var(--mono);
  font-size: 34px;
  color: var(--accent);
}

.tease-gauge span,
.tease-panel-title,
.tease-topic-card span,
.tease-plan-card p,
.tease-task-list span,
.tease-fc-card span,
.tease-fc-card em {
  color: var(--text3);
  font-size: 11px;
}

.tease-panel { padding: 16px; }
.tease-wide { grid-column: 1 / -1; }
.tease-panel p { color: var(--text2); font-size: 13px; line-height: 1.55; margin: 10px 0 0; }
.tease-panel-title { font-weight: 800; color: var(--text); margin-bottom: 10px; }

.tease-bar-row {
  display: grid;
  grid-template-columns: 74px 1fr 38px;
  gap: 8px;
  align-items: center;
  margin: 8px 0;
}

.tease-bar-row span {
  height: 9px;
  border-radius: 5px;
  background: var(--surface2);
}

.tease-bar-row div,
.tease-topic-bar {
  height: 6px;
  border-radius: 999px;
  background: var(--surface2);
  overflow: hidden;
}

.tease-bar-row i,
.tease-topic-bar i {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: var(--accent);
}

.tease-bar-row b {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--text2);
  text-align: right;
}

.tease-chip-grid,
.tease-task-list {
  grid-column: 1 / -1;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tease-chip-grid span,
.tease-task-list span {
  padding: 7px 10px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text2);
  font-size: 12px;
}

.tease-topic-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  align-content: start;
}

.tease-topic-card {
  padding: 14px;
  display: grid;
  gap: 12px;
}

.tease-topic-card b {
  display: block;
  color: var(--text);
  font-size: 13px;
  margin-bottom: 3px;
}

.tease-topic-card button {
  border: none;
  border-radius: 7px;
  background: var(--accent);
  color: #fff;
  padding: 8px 10px;
  font-size: 12px;
  font-weight: 700;
}

.tease-calendar {
  display: grid;
  gap: 14px;
  align-content: start;
}

.tease-plan-card { padding: 18px; }
.tease-plan-card b { color: var(--text); }

.tease-week {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 8px;
}

.tease-week div {
  min-height: 72px;
  border-radius: 10px;
  background: var(--card);
  border: 1px solid var(--border);
  padding: 8px;
}

.tease-week b {
  display: block;
  color: var(--text3);
  font-size: 11px;
  margin-bottom: 12px;
}

.tease-week span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 26px;
  height: 22px;
  border-radius: 7px;
  background: var(--accent-subtle);
  color: var(--accent);
  font-size: 12px;
  font-weight: 800;
}

.tease-formula-layout {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 14px;
}

.tease-formula-tree {
  padding: 12px;
  display: grid;
  gap: 8px;
  align-content: start;
}

.tease-formula-tree span {
  display: block;
  padding: 9px 10px;
  border-radius: 7px;
  background: var(--surface);
  color: var(--text2);
  font-size: 12px;
}

.tease-formula-list {
  display: grid;
  gap: 10px;
  align-content: start;
}

.tease-formula-list > div { padding: 14px; }
.tease-formula-list b { display: block; color: var(--text); font-size: 13px; margin-bottom: 8px; }
.tease-formula-list code { color: var(--accent); font-size: 13px; }

.tease-exam-paper {
  max-width: 720px;
  margin: 0 auto;
  padding: 28px;
}

.tease-exam-title { font-size: 14px; font-weight: 800; color: var(--text); margin-bottom: 12px; }
.tease-exam-paper p { color: var(--text2); line-height: 1.7; }

.tease-answer-row {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 10px;
  align-items: center;
  margin-top: 20px;
}

.tease-answer-row span { color: var(--text3); font-size: 12px; }
.tease-answer-row div { height: 38px; border-radius: 8px; border: 1px solid var(--border); background: var(--surface); }
.tease-answer-row button { border: none; border-radius: 8px; background: var(--accent); color: #fff; padding: 0 14px; height: 38px; font-weight: 700; }

.tease-solution-lines { display: grid; gap: 9px; margin-top: 24px; }
.tease-solution-lines i { display: block; height: 10px; border-radius: 6px; background: var(--surface2); }
.tease-solution-lines i:nth-child(2) { width: 76%; }
.tease-solution-lines i:nth-child(3) { width: 58%; }

.tease-theory {
  max-width: 680px;
  margin: 0 auto;
  padding: 26px;
}

.tease-theory h3 { margin: 0 0 12px; color: var(--text); }
.tease-theory p { color: var(--text2); line-height: 1.7; }
.tease-formula-box { margin: 18px 0; padding: 16px; border-radius: 10px; background: var(--accent-subtle); color: var(--accent); text-align: center; font-family: var(--mono); font-weight: 800; }
.tease-example { display: grid; gap: 4px; padding: 12px; border-radius: 8px; background: var(--surface); }
.tease-example b { color: var(--text); }
.tease-example span { color: var(--text3); font-size: 12px; }

.tease-fc-card {
  max-width: 420px;
  min-height: 260px;
  margin: 42px auto 0;
  padding: 28px;
  display: grid;
  place-items: center;
  text-align: center;
  gap: 14px;
}

.tease-fc-card strong {
  font-size: 26px;
  color: var(--text);
  font-family: var(--mono);
}

.fc-tease-inner {
  max-width: 760px;
}

.fc-tease-close {
  margin-top: 12px;
  width: 100%;
}

@media (max-width: 700px) {
  .tease-shell { min-height: 560px; padding: 16px; }
  .tease-preview { inset: 10px; }
  .tease-card { padding: 22px 20px; }
  .tease-card h2 { font-size: 21px; }
  .tease-dashboard,
  .tease-formula-layout,
  .tease-topic-grid { grid-template-columns: 1fr; }
  .tease-week { grid-template-columns: repeat(4, 1fr); }
  .tease-actions { flex-direction: column; }
  .tease-primary,
  .tease-secondary { width: 100%; }
}

@media (max-width: 600px) {
  .wiz-card { padding: 20px 16px; }
  .wiz-step-title { font-size: 18px; }
  .wiz-q-opt { min-width: 60px; padding: 10px 8px; }
  .wiz-days-grid { grid-template-columns: repeat(4, 1fr); }
  .wiz-settings-bar { flex-direction: column; align-items: stretch; }
}

/* ── Test config footer ──────────────────────────────────── */
.tc-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 10px;
  margin-top: 8px;
  border-top: 1px solid var(--border);
  gap: 8px;
  flex-wrap: wrap;
}
.tc-q-controls {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}
.tc-presets { display: flex; gap: 2px; }

@media (max-width: 540px) {
  .tc-presets { display: none; }
  #test-gen-btn { width: 100%; justify-content: center; }
  #analysis-inner { padding: 16px 12px; }
}

@media (max-width: 640px) {
  .demo-section { padding: 56px 0 72px; }
  .demo-stage { margin-top: 32px; }
  .demo-browser { border-radius: 10px; }
  .demo-play-icon { width: 48px; height: 48px; }
}

/* ============================================================
   AI tutor polish
   Use these classes on the tutor root:
   .ai-tutor, .ai-tutor-shell, .ai-chat, .tutor-chat, or .tutor-panel
   ============================================================ */
.ai-tutor,
.ai-tutor-shell,
.ai-chat,
.tutor-chat,
.tutor-panel {
  --tutor-bg: #101322;
  --tutor-surface: #151a2b;
  --tutor-surface-2: #1b2136;
  --tutor-line: rgba(132, 148, 176, 0.18);
  --tutor-line-strong: rgba(132, 148, 176, 0.28);
  --tutor-text: #f5f7fb;
  --tutor-muted: #aeb8cb;
  --tutor-dim: #738098;
  --tutor-blue: #5b8cff;
  --tutor-cyan: #5eead4;
  --tutor-green: #38d996;
  --tutor-gold: #f4c95d;
  --tutor-red: #ff6b7a;
  color: var(--tutor-text);
  background:
    radial-gradient(circle at 0% 0%, rgba(94,234,212,0.13), transparent 28%),
    radial-gradient(circle at 100% 8%, rgba(91,140,255,0.16), transparent 30%),
    linear-gradient(180deg, #121625 0%, #0f1220 100%);
  border: 1px solid var(--tutor-line);
  border-radius: 8px;
  box-shadow: 0 24px 70px rgba(8, 12, 24, 0.34), 0 1px 0 rgba(255,255,255,0.04) inset;
  overflow: hidden;
}

.ai-tutor *,
.ai-tutor-shell *,
.ai-chat *,
.tutor-chat *,
.tutor-panel * {
  letter-spacing: 0;
}

.ai-tutor-header,
.tutor-header,
.ai-chat-header {
  min-height: 58px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 16px;
  background: rgba(255,255,255,0.035);
  border-bottom: 1px solid var(--tutor-line);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}

.ai-tutor-title,
.tutor-title,
.ai-chat-title {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
  font-size: 14px;
  font-weight: 750;
  color: var(--tutor-text);
}

.ai-tutor-subtitle,
.tutor-subtitle,
.ai-chat-subtitle {
  margin-top: 2px;
  font-size: 12px;
  line-height: 1.35;
  color: var(--tutor-muted);
}

.ai-tutor-status,
.tutor-status,
.ai-chat-status {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  min-height: 26px;
  padding: 0 9px;
  border: 1px solid rgba(94,234,212,0.26);
  border-radius: 999px;
  background: rgba(94,234,212,0.08);
  color: #b9fff2;
  font-size: 11px;
  font-weight: 650;
  white-space: nowrap;
}

.ai-tutor-status::before,
.tutor-status::before,
.ai-chat-status::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--tutor-cyan);
  box-shadow: 0 0 0 4px rgba(94,234,212,0.12);
}

.ai-tutor-body,
.tutor-body,
.ai-chat-body,
.ai-tutor-messages,
.tutor-messages,
.chat-messages {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 16px;
  overflow-y: auto;
  scroll-behavior: smooth;
}

.ai-message-row,
.tutor-message-row,
.chat-message-row,
.message-row {
  display: flex;
  align-items: flex-end;
  gap: 10px;
  max-width: 100%;
}

.ai-message-row.user,
.tutor-message-row.user,
.chat-message-row.user,
.message-row.user,
.user-message-row {
  justify-content: flex-end;
}

.ai-avatar,
.tutor-avatar,
.bot-avatar,
.assistant-avatar {
  width: 32px;
  height: 32px;
  flex: 0 0 32px;
  display: grid;
  place-items: center;
  border: 1px solid rgba(94,234,212,0.34);
  border-radius: 50%;
  background:
    linear-gradient(135deg, rgba(94,234,212,0.20), rgba(91,140,255,0.20)),
    #111827;
  color: #e9fffb;
  box-shadow: 0 8px 22px rgba(0,0,0,0.26), 0 0 0 4px rgba(94,234,212,0.08);
  font-size: 15px;
}

.user-avatar {
  width: 32px;
  height: 32px;
  flex: 0 0 32px;
  display: grid;
  place-items: center;
  border: 1px solid rgba(91,140,255,0.36);
  border-radius: 50%;
  background: linear-gradient(135deg, #3b82f6, #6366f1);
  color: #fff;
  font-size: 13px;
  font-weight: 750;
}

.ai-message,
.assistant-message,
.bot-message,
.tutor-message,
.chat-bubble.ai,
.message.ai,
.message.assistant {
  position: relative;
  max-width: min(78%, 620px);
  padding: 13px 14px;
  border: 1px solid rgba(91,140,255,0.20);
  border-radius: 8px;
  background:
    linear-gradient(180deg, rgba(255,255,255,0.055), rgba(255,255,255,0.025)),
    var(--tutor-surface-2);
  color: var(--tutor-text);
  box-shadow: 0 10px 28px rgba(0,0,0,0.18), 0 1px 0 rgba(255,255,255,0.05) inset;
  font-size: 14px;
  line-height: 1.58;
}

.user-message,
.chat-bubble.user,
.message.user {
  max-width: min(72%, 560px);
  padding: 11px 13px;
  border: 1px solid rgba(91,140,255,0.34);
  border-radius: 8px;
  background: linear-gradient(135deg, #2f56d7, #4f67e8);
  color: #fff;
  box-shadow: 0 10px 26px rgba(47,86,215,0.28);
  font-size: 14px;
  line-height: 1.5;
}

.ai-message strong,
.assistant-message strong,
.bot-message strong,
.tutor-message strong,
.chat-bubble.ai strong,
.message.ai strong,
.message.assistant strong {
  color: #ffffff;
  font-weight: 760;
}

.ai-message code,
.assistant-message code,
.bot-message code,
.tutor-message code,
.chat-bubble.ai code,
.message.ai code,
.message.assistant code,
.ai-message .katex,
.assistant-message .katex,
.bot-message .katex,
.tutor-message .katex {
  color: #f9fbff;
}

.ai-message .math-step,
.assistant-message .math-step,
.tutor-message .math-step,
.solution-step,
.tutor-step {
  margin: 10px 0;
  padding: 10px 11px;
  border-left: 3px solid var(--tutor-cyan);
  border-radius: 8px;
  background: rgba(94,234,212,0.075);
}

.ai-message.correct,
.assistant-message.correct,
.tutor-message.correct,
.message.correct {
  border-color: rgba(56,217,150,0.38);
  background:
    linear-gradient(180deg, rgba(56,217,150,0.13), rgba(56,217,150,0.045)),
    var(--tutor-surface-2);
}

.ai-message.partial,
.assistant-message.partial,
.tutor-message.partial,
.message.partial {
  border-color: rgba(244,201,93,0.38);
  background:
    linear-gradient(180deg, rgba(244,201,93,0.13), rgba(244,201,93,0.04)),
    var(--tutor-surface-2);
}

.ai-message.wrong,
.assistant-message.wrong,
.tutor-message.wrong,
.message.wrong {
  border-color: rgba(255,107,122,0.36);
  background:
    linear-gradient(180deg, rgba(255,107,122,0.12), rgba(255,107,122,0.035)),
    var(--tutor-surface-2);
}

.ai-tutor-input,
.tutor-input,
.ai-chat-input,
.chat-input-row {
  display: flex;
  align-items: flex-end;
  gap: 10px;
  padding: 13px;
  border-top: 1px solid var(--tutor-line);
  background: rgba(10, 14, 26, 0.72);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
}

.ai-tutor-input textarea,
.ai-tutor-input input,
.tutor-input textarea,
.tutor-input input,
.ai-chat-input textarea,
.ai-chat-input input,
.chat-input-row textarea,
.chat-input-row input {
  width: 100%;
  min-height: 42px;
  max-height: 140px;
  resize: vertical;
  padding: 11px 12px;
  border: 1px solid var(--tutor-line-strong);
  border-radius: 8px;
  outline: none;
  background: rgba(255,255,255,0.055);
  color: var(--tutor-text);
  box-shadow: 0 1px 0 rgba(255,255,255,0.04) inset;
  font: inherit;
}

.ai-tutor-input textarea::placeholder,
.ai-tutor-input input::placeholder,
.tutor-input textarea::placeholder,
.tutor-input input::placeholder,
.ai-chat-input textarea::placeholder,
.ai-chat-input input::placeholder,
.chat-input-row textarea::placeholder,
.chat-input-row input::placeholder {
  color: var(--tutor-dim);
}

.ai-tutor-input textarea:focus,
.ai-tutor-input input:focus,
.tutor-input textarea:focus,
.tutor-input input:focus,
.ai-chat-input textarea:focus,
.ai-chat-input input:focus,
.chat-input-row textarea:focus,
.chat-input-row input:focus {
  border-color: rgba(94,234,212,0.46);
  box-shadow: 0 0 0 4px rgba(94,234,212,0.10), 0 1px 0 rgba(255,255,255,0.06) inset;
}

.ai-tutor-send,
.tutor-send,
.ai-chat-send,
.chat-send {
  width: 42px;
  height: 42px;
  flex: 0 0 42px;
  display: grid;
  place-items: center;
  border: 1px solid rgba(94,234,212,0.34);
  border-radius: 8px;
  background: linear-gradient(135deg, #1f8fff, #4f67e8);
  color: #fff;
  box-shadow: 0 12px 28px rgba(31,143,255,0.26);
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease, filter 0.15s ease;
}

.ai-tutor-send:hover,
.tutor-send:hover,
.ai-chat-send:hover,
.chat-send:hover {
  transform: translateY(-1px);
  filter: brightness(1.04);
  box-shadow: 0 16px 34px rgba(31,143,255,0.32);
}

.ai-tutor-send:disabled,
.tutor-send:disabled,
.ai-chat-send:disabled,
.chat-send:disabled {
  cursor: default;
  opacity: 0.48;
  transform: none;
  box-shadow: none;
}

.ai-thinking,
.tutor-thinking,
.typing-indicator,
.thinking-bubble,
.message.thinking {
  width: fit-content;
  max-width: min(78%, 420px);
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 11px 13px;
  border: 1px solid rgba(94,234,212,0.22);
  border-radius: 8px;
  background:
    linear-gradient(90deg, rgba(94,234,212,0.09), rgba(91,140,255,0.07)),
    rgba(27,33,54,0.88);
  color: var(--tutor-muted);
  box-shadow: 0 10px 26px rgba(0,0,0,0.16);
  font-size: 13px;
  line-height: 1.3;
}

.ai-thinking::before,
.tutor-thinking::before,
.typing-indicator::before,
.thinking-bubble::before,
.message.thinking::before {
  content: "";
  width: 16px;
  height: 16px;
  border: 2px solid rgba(94,234,212,0.22);
  border-top-color: var(--tutor-cyan);
  border-radius: 50%;
  animation: tutorSpin 0.9s linear infinite;
}

.typing-dots,
.ai-thinking-dots,
.tutor-thinking-dots {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.typing-dots span,
.ai-thinking-dots span,
.tutor-thinking-dots span {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--tutor-cyan);
  opacity: 0.4;
  animation: tutorDot 1.2s ease-in-out infinite;
}

.typing-dots span:nth-child(2),
.ai-thinking-dots span:nth-child(2),
.tutor-thinking-dots span:nth-child(2) {
  animation-delay: 0.15s;
}

.typing-dots span:nth-child(3),
.ai-thinking-dots span:nth-child(3),
.tutor-thinking-dots span:nth-child(3) {
  animation-delay: 0.3s;
}

.ai-tutor-chip,
.tutor-chip,
.ai-suggestion-chip,
.tutor-suggestion {
  display: inline-flex;
  align-items: center;
  min-height: 30px;
  padding: 0 10px;
  border: 1px solid var(--tutor-line);
  border-radius: 999px;
  background: rgba(255,255,255,0.045);
  color: var(--tutor-muted);
  font-size: 12px;
  font-weight: 620;
}

.ai-tutor-actions,
.tutor-actions,
.ai-suggestions,
.tutor-suggestions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 10px;
}

.ai-tutor-action,
.tutor-action,
.ai-suggestion,
.tutor-suggestion {
  cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease, color 0.15s ease, transform 0.15s ease;
}

.ai-tutor-action:hover,
.tutor-action:hover,
.ai-suggestion:hover,
.tutor-suggestion:hover {
  transform: translateY(-1px);
  border-color: rgba(94,234,212,0.36);
  background: rgba(94,234,212,0.09);
  color: #eafffb;
}

@keyframes tutorSpin {
  to { transform: rotate(360deg); }
}

@keyframes tutorDot {
  0%, 80%, 100% { opacity: 0.35; transform: translateY(0); }
  40% { opacity: 1; transform: translateY(-3px); }
}

@media (prefers-reduced-motion: reduce) {
  .ai-thinking::before,
  .tutor-thinking::before,
  .typing-indicator::before,
  .thinking-bubble::before,
  .message.thinking::before,
  .typing-dots span,
  .ai-thinking-dots span,
  .tutor-thinking-dots span {
    animation: none;
  }
}

@media (max-width: 640px) {
  .ai-tutor,
  .ai-tutor-shell,
  .ai-chat,
  .tutor-chat,
  .tutor-panel {
    border-left: none;
    border-right: none;
    border-radius: 0;
  }

  .ai-tutor-header,
  .tutor-header,
  .ai-chat-header,
  .ai-tutor-body,
  .tutor-body,
  .ai-chat-body,
  .ai-tutor-messages,
  .tutor-messages,
  .chat-messages,
  .ai-tutor-input,
  .tutor-input,
  .ai-chat-input,
  .chat-input-row {
    padding-left: 12px;
    padding-right: 12px;
  }

  .ai-message,
  .assistant-message,
  .bot-message,
  .tutor-message,
  .chat-bubble.ai,
  .message.ai,
  .message.assistant,
  .user-message,
  .chat-bubble.user,
  .message.user {
    max-width: calc(100% - 42px);
  }

  .ai-tutor-status,
  .tutor-status,
  .ai-chat-status {
    display: none;
  }
}